I wouldn't say "no upside". He puts the Colts in almost every game because he plays in a way that leads to close games. The upside over Eason is that the Colts would probably be fighting for a playoff spot with a .500 record or close late in the season. With Eason, the ceiling is higher, but so is the floor at this point. This team could be 4-12 with Eason as QB.
I'd think there would be some who would still talk about him. A certain body builder comes to mind.
Andrew's a very private person, and with so little information to go off of, a lot of people will attempt to connect the dots of what led to our franchise QB up and retiring so shockingly. I'm not saying it's right, and I'm certainly guilty of my own bias and thought entertainments.
Maybe some day we will read a biography that tells us what really happened. I'm sure we're not the only ones in the sporting world who are curious about what led to a star player in his prime to up and leave.