Agreed.

Mr. C, as I'll call him, is clearly the doppelgänger. For now, it seems like BOB is not even around. (I was ready during the long mirror scene, though!)

With Leland, I always assumed BOB was leaving and entering his host (and possibly others) whenever he deemed necessary. If he returns, maybe he'll take control of the doppelgänger at some point too?

Ostensibly you're right, although the original mirror scene makes that a bit murky. I feel like it's possible that BOB may be kind of "riding along" witch Cooper's  shadow self

This has been my thought too but... There is a big but, the last "mirrorscene" in season 2. Doppelganger Cooper smashes his head and BOB looks back at him in the reflection. My thoughts on this is that our Agent Cooper has never been possessed by BOB. But BOB created the Doppelganger Cooper so BOB is the doppelganger in a way, with the possibility to possess the doppelganger whenever he wants to. Even if BOB is not in the doppelganger all the time the doppel us always a evil son of a bitch all the time like season 3 shows. But BOB and the doppel are connected all the time in some way. During the call in part 2 of 3? with Philip you can clearly hear Philip say that it is time for the doppelganger to return to the Black Lodge so Philip can be with BOB again.

I totally agree with you all. I forgot to mention my thoughts on that finale mirror scene as well, but you've all covered it. 🙂

Also, I agree with saying Mr. C. I hadn't thought about it, until someone said to me on Facebook that saying evil Cooper is a little spoiler. I countered saying we've known about that character for a while, but they replied, "But we didn't know that character was going to be in the new season." I shrugged saying it had bee discussed in media that the new season was going to at least partially cover Cooper's journey in the lodge, but still, Mr. C works better, I guess. 🙂 

Next up: Mr. D!

He's definitely not possessed by BOB.

Question: did 'Good Dale' actually get out of the Black Lodge at the end? Or  was he trapped in the glass box?

GoodCoop is out, BadCoop created a being (Dougie, think of him as a Golem type creation) to serve as a replacement when the switch is supposed to go down, thus both Good and Bad are outside of the lodge, prompting Mike to warn GoodCoop in a mentally rough state (Señor DroolCoop?) that they were tricked, and since things are out of balance one of them has to die. 

Upon further reflection, I think this completely clears up whether or not BadCoop is possessed by BOB- he is not. BOB cannot be killed, only sent back. Coop and his evil Doppelgänger are both out at the same time, and one must die.

Additionally- I actually think we've already seen BadCoop interact with BOB. When he shoots Mrs. Hastings, I believe she was possessed by BOB, who actually committed the apartment murders/body mutilation. When she's shot, you see something/someone leaving her body. I think it's bob. I'm pretty sure I see denim. BadCoop even remarks on her behavior- something like "good job, you even seemed human"

I've written something about this in another thread, to me honestly the whole thing is really messed up, because the doppelganger thing wasn't introduced until the very last episode of the original series, while possession has been constantly part of the show. Maybe Lynch had it in his mind from earlier in the show and it came out only in the last episode because he stayed out of the project for much of the second season, but it's pretty clear that there's a mess between the two, and it's made even more complicated by the fact that the doppelganger thing has become a constant of his works, while possession went totally out of fashion.

So, while I totally agree that Mr. C is evil Cooper and doesn't seem to have anything to do with Bob (as I wrote, he looks like a regular, human, bad guy, like those in Blue Velvet/Wild at Heart with someting of Jean Renault and a lot of Windom Earle), I think Lynch's not fully honest when he says Coop's never been possessed by Bob, as he clearly was in the final scene of the second season (and in fact his behavior is very different from what we've seen this far in season 3, more similar to that of Leland). Imho it's just something that wasn't completely thought out back then and he has changed his mind and his tastes since then.

I think it'd be way easier to just say that, even if it's true that the good Cooper is trapped in the Lodge and the one outside is the evil doppelganger, Bob has (at least initially) used the evil counterpart as a host, moving on to other hosts afterwards, the last of which possibly being William Hastings (as he claims to have been in Ruth's room only in dreams, thus seemingly being unaware of what he did when he killed her, something very similar to what happened to Leland, and especially considering how Bob is able to make contact with people during their dreams).

I call him DoppelDale

It is interesting to note though, that both Coopers now reside in the "real" world; if Bob was possessing Cooper, could both Coopers co-exist in the outside world? It makes much more sense to me for there to be a Coop and a doppelganger for both parties to exist. If Coop was possessed, then Bob would be attached to one being/vessel exclusively, correct?

It is indeed confusing due to the final mirror scene in season 2; also, I can see how Mr. C bears resemblance to Bob in his hair, clothing, and very rough (and bronzed 😉 lol ) features.

All I can say: Wow BOB Wow!:)

It actually explains a lot. Didn't noticed that but what I did when first time seeing was weirdness of the phrase Mr C speaks to Phyllis (human nature). Like it was said TO Bob, not BY Bob. Initially I thought that Coop was Bob but now I'm sure we see doppelganger who's somehow connected, "befriended" with Bob, just like Mike before. The one and only so far flashback of Bob we got, we seing bad Coop and Bob next to each other laughing maniacally.

By the way- is Philip Gerard really possessed by Mike? Or is Mike Gerard's doppelganger? They both look the same contarily to Leland/Bob different appearances. Mr C looks are definetely inspired by Bob- not only long hair but kinda Indian style of his haircut and skin tone.

Another very important question- where is Bob now? I think he might be back in Twin Peaks... He's not, let say, global evil:) He's very local, connected to the woods in Twin Peaks ("something connected to Hawk's heritage") and... But this is my intuition only, probably silly, I think we will have another teen murder in TP. It has not been even suspected now, too obvious, but:

- It is happening again

- the first shots we get in Part 1 are flashbacks from school hall and running female student... very disturbing

- Shelly mentions about her daughter who acts strangely

To be honest I dont know how will wait till 4th of July:)

In reference to Mr. C's appearance, he is clearly a drifter and spends much of his time out in the plains/desert so he simply has a crazy sun crisped skin and wind raked hair. I don't think he is meant to look like BOB or a native american. Just Coop if he didnt spend all his time in offices and diners.

My thought on the final S2 scene in the mirror is that BOB came to say "nicely done" he wasnt IN anyone. He has been shown to free roam and appear as a vision to MANY people throughout the series. 

Thanks to OP for this thread. Its been driving me crazy.

I still think that Mr C's appearance is inspired by Bob hence Indian heritage. Anybody noticed small clip in his hair? When Mike and Bob used to act together, they shared the same tatoo. BTW I'm wondering if we hear the phrase Fire Walk Me again.