Judy is the experiment
Could Judy be Caroline Earle? Since everyone who's talking about (& is supposed to know) her is associated with the FBI, & she was Windom Earle's wife?
Possibly, but only if she's a tulpa (since Windom killed her or maybe he killed her tulpa?). The original idea was that Judy might have been Josie's sister (as hinted at by Robert Engels cowriter for FWWM). But that may have been abandoned by Lynch and Frost for TPTR (and is possibly one of the reasons Josie is not in season 3).