Rosen looks like a pipedream, he'll be in Cleveland.
I think Darnold will go back to USC, if he doesn't I think the Giants take him.
That being said I think Lamar Jackson can be a difference maker, he had a bad bowl game with the 4 INT, but he also threw for 1 TD and ran for over 150+ yards and 2 TD. He has the arm, the legs, will need to beef up in the NFL but he can be a difference maker. I like the moxy of Mayfield but I like the full body of work from Jackson, he's gotten better each year with his accuracy and standing in the pocket when the play isn't a designed QB run.