I'll take that bet.
Regardless of circumstances, Darnold was the worst QB in the NFL. I watched their games (and enjoyed it greatly) last season and when he had no pressure on him he seemed confused about who actually played for his team, took a long time to process the field, making sill mental errors like running out of bounds behind the line (multiple times) and was not in command of the offense at all. The *SAME* problems he had in college.
I'm not sure why a guy who had problems in college, continued those problems in the pros is suddenly going to turn it around because he gets the 'good' coaching. On top of that, it's exceedingly rare that a clear top 10 bust (let's say 20th and below for 3 years running) leaves the team that drafted them and then goes on to success elsewhere. There's a reason for that.
Most of his "he's gonna turn it around" hype seems to be from people who are carrying over that Darnold was a highly touted prospect in the draft and haven't watched him in the last two years.
Gase is a control freak buffoon who only ever had success when he was getting Manning coffee, but Darnold was awful. Their offense performed better with the animated corpse of a disinterested Joe Flacco. Both gase and Darnold can be bad at the same time.