My opinion is Fleming is a risk and will affect the offense, this last game he was less than average. Moving the pieces on the Oline just allows the backup replacements to play at their optimum positions. We have a Left Tackle with a bad back, along with a center coming back from a season ending nerve injury, next to our all pro guard with a nebulous leg injury. This is probably more the standard for the NFL for injuries rather than everyone being fully rested and cured.
Great point on McGovern, I actually thought they might try and hide him on IR but looks like that ship has sailed.
It's fair enough to worry about Fleming, but if he's so bad we'll flop position on 2 starters instead of putting him on the field, we need another swing T.
Changing position is no triviality for the player or the line as a whole.
Collins was given an offseason to acclimate to RT, and still had clear growing pains for half a season adjusting. And his college career was as a T.
Chaz Green went from a serviceable backup at LT to a crappy LG in an offseason, and then a horrible LT when they switched him back midseason.
And then there's the chemistry of the line as a whole, of each player getting in sync with how the guy next to him plays.
If you want to flop a guy, just flop Williams to LT, where he played his college ball. He seems more like a LT than Collins anyway, although admittedly Collins has always seemed to me like a guy who didn't fit the mold for any oline position. Not that he can't play, he just plays in an atypical way.