Yeah, who cares what they play like when they get moved around. The very fact they are moved is a recipe for disaster.
One more time, I've never been on a football team that wasn't moving players around due to injuries. That's not always comfortable and at times you pretty much know that might be a problem. OTOH, giving others a chance to perform in playing conditions gives them a chance to shine. Many, many new guys got their start due to injuries to starters.
Free underperformed at times the first two thirds of last year. He's played solid the last 4 games of last year and into camp and the preseason both at tackle and at guard. Parnell and Smith played well the last 4 games as well. Other than to bemoan moving people around as if that's always a bad idea you aren't saying anything about how they are actually playing.