“Yes, I know. I know who’s the Thing and who’s not in the very end,” he said during an interview with ComicBook.com. But if you were hoping for any elaboration, then keep on hoping. “Nope,” Carpenter added when probed for more information. “Cannot tell you. Sorry,”
It was pretty much the same answer he gave SYFY WIRE last summer: “I know, but I’m not telling you … I just feel like it’s a secret that must be kept. The gods came down and swore me to secrecy.”
Yeah man, it was his way to hide.
That could work. It would ultimately be less suspicious than if everyone turned out human in the test after they know something is going on.