I ranked them Allen, Rosen, Darnold, Mayfield, and Jackson. At this point I'm not sure I would reorder them.
I still think Rosen has a chance to prove himself. Unbelievably he is now on the two worst rosters in the NFL in a row.
I still am not sold on Mayfield. He started well last year then tailed off. I always thought Jackson was a better passer than most of the media and this board thought. But his college completion % and low Wonderlic put him last on my list.
As for Darnold - watch any game where he was rushed in the pocket and the outcome was not good. Maybe that is true of most college QBs. Right now I don't think he will be anywhere close to Carson Palmer but will probably be better than Sanchez.