Brad Biggs at the Chicago Tribune reminds me of a point I've been meaning to make as he answers your questions:
“Why is Marc Trestman emphasizing Jay Cutler has a high ankle sprain? Is it to stress his groin is fine? — @bbuddhas from Twitter
“Probably because he’s gotten a high number of questions about what is wrong with Cutler. There has been a lot of misinformation out there about Cutler but he is sidelined with a high ankle sprain. The groin might not be 100 percent but it is good enough for him to play on and has been.”
Yes, that's possible. But I think its more likely that Trestman is convering for a medical staff that gave Cutler the go ahead to play on a bad groin too soon. As many others have noted Cutler was grabbing his groin not his ankle in that last game.
You'll note that he's been much more cautious about letting Cutler come back from the “high ankle sprain” than he was coming off of the graoin injury. That's probably because he's learned to fully trust neither Cutler nor the medical staff. As well he shouldn't.