It's absolutely true that Carrington has had a poor year shooting. And, I believe he's a very good shooter who shot poorly. The college landscape is littered with very good shooters who shot very badly in their freshman season. That doesn't mean Carrington will emerge as a great shooter next year, but when you look at his stroke and you've watched him play in high school, it seems unlikely he will continue to shoot poorly.
His issue will be getting his shot off-if he doesn't improve his ability to drive and get to the basket it will be tough for him. He also can help the team with his defense (he got beat repeatedly early in the year on back doors, but he seems to have cleaned that up), which is starting to come around, and his rebounding ability, which is something sorely needed on this team. At some point he's going to be a valuable shooter for the Gophers, who are also badly in need of other shooters.
I like the prospect next year of having 4 shooters spreading the floor around Payne or Evans (assuming Evans shows some offensive capability). That hasn't happened at all this year. Battle and Garcia could be in a lineup with a portal guard who can shoot it and one other shooter to emerge from Carrington, Christie, Henley. That would have a large impact on their ability to score points. It's a lot of "ifs" but it's not too much of a stretch.