Hub Arkush at chicagofootball.com answers your questions:
Q: “Wouldn’t it have been worth a try to move [Jordan] Mills to right guard before releasing him?”
A: “I would have liked to have seen Mills get that chance because I think it is probably his natural position and he’s such a great kid it was hard not to pull for him. But the reality is Patrick Omahmeh is actually a better prospect at guard than either Mills or Vladimir Ducasse and the Bears did not have the luxury of keeping all three. At the end of the day, my guess is the Bears just didn’t see enough physicality out of Mills to suggest he is going to make it anywhere in the NFL.”
Moving Mills to guard wouldn’t have solved the major issue – lack of concentration. Mills simply made to many mistakes, his pre-snap penalties being the most evident of them. The guess here is that the current staff recognized that this wasn’t going to get better much earlier than the last staff did and that was the root of Mills’s demise.