Um, if I may talk?
GCat was seen with the Condesce in the [S] Droog: Ascend more casually flash, and then again, years in the future, when Dirk gave exposition on RDave and RRose. So if he's there in LOPAN with Roxy and Jane, how does he get to Derse/the future? Sorry for any unrelated talk, btw.
That's...a very good question, actually.
I mean, we do know that there's a teleporter to sessions in the Frog Temple. If anything, I'd venture that GCat entered/left the session whenever the Condesce did, since she's in direct control of him/her.
Also, note that it's April 13th, 2012 for Jane and Jake...which is exactly three years from when the A2 and B1 teens started their journey to the B2 session. Hang in there, Jake! I'm sure (if everything goes to plan, which is a risky bet in Homestuck) everyone will arrive at some point in the next 24 hours. Relative to you, of course.