Jimmy G isn't a certainty either from what I read.
I think he's practicing now, but still technically a question mark for this weekend.
I didn't know until after the game that he played the end of the Dallas game with a sprained shoulder.
That could explain some things, like the INT, etc
After writing this, I read that all three players, Jimmy G, Werner, and Bosa, were described as "having a chance" to play this weekend.
Of course that doesn't say much in detail.
As "having a chance" could mean anywhere from a 1% to a 99% chance of playing. Everything in between those numbers qualifies as a chance.