Okay, I have a theory...
The "coming up on this season of PR4" trailers seems to show a lot more of Chris than we've seen to date... I'd have to go back and see if all of his comments in said trailer have been covered in the episodes aired so far. On the flip side, we don't see much of Jack after his "announcement", which is coming next week.
Jack has previously revealed that he is HIV positive (did you see the 12-gallon ziploc bag of drugs the man has to deal with on a daily basis? The poor guy!) My theory is this:
Jack announces that he has to leave the show due to health reasons. As they did on season one of "Top Chef", they allow the last person booted to return... Andrea got the break on "Top Chef"; could Chris get a similar break?
I, personally, love Jack and his designs so far. (And PS - I don't fault him at all for scarfing the best model of the bunch this past week... this is a competition after all!) But I thought Chris was equally talented and, if Jack does go, it would be a silver lining to see Chris return.
Am I crazy? Could this actually happen?
Oh, and by the way, Lee Harvey Oswald did NOT act alone.