Well, it's a little bit rocket sciency because there are a couple of questions to ask:
Are we planning to keep the old man for another year? If so, why risk getting him hurt when the season is mathematically done and done?
Are we planning on keeping Rosen? He did cost a 2 and he is young. If so, why not give him the opportunity to grow and learn and vibe with the offense?
So, for the record, I'm not a rocket scientist. I just wanna put that out there. Lol
But I do believe my questions have validity: why risk injuring Fitz if the season is over? Why not give Rosen a chance to better himself if the season is over?