Rosen has played two seasons behind historically bad offensive lines.
Last season Arizona has 7 offensive linemen go on IR, to include
all 5 starters.
PFF
ranked the Dolphins OL as the worst in the league before the season started. That rank was given when Tunsil was still on the team too. They've changed their start starting OL lineup 5 times in 5 games. I think they also have the worst average draft position starting OL in the league in the well.
Add to the fact that he has played for 3-13 Steve Wilks and now 0-5 Brian Flores as his head coaches.
I'm not saying the kid is good or will become good, but how can anyone be accurately evaluated considering the above.