I always took it to be Griggs was assimilated. When they ask him if he left the door open he just says "I cant remember." Given the location I would think shutting doors would be pretty important, but the Thing wouldnt know that so we get the answer he gave. Then somehow he infects Juliette, kind of like the guy in the original who had the heart attack, like a little takes a while to fully take you over and during the process the "host" starts feeling bad, but of course doesnt know why. I would assume the blood in the bathroom is from her fully transitioning...at least it could be assumed she as going to the bathroom since she felt sick.
As for the co-leader, although it wasnt asked, no idea.
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