Pyne just is what he is. If ND disbanded the football program and the other CFB teams held a draft of ND players, he would be picked like 50th. Pyne is just playing the cards he was dealt; he hasn't grown since like 10th grade.
So, it's on Rees to figure it out. You know he can't beat drop coverage, you know he is bad at throwing screen passes, and you know he can't see over the line. Don't make him do things he can't do.
I'm not getting paid $2 million to figure it out, so I don't have the answers. But I know ND can't just keep asking him to do the same things over and over, when anyone with a TV can see it won't work. Move him out of the pocket so he can see, give him easy triangle reads on half the field, get some kind of RPO going that he is comfortable running, throw to Tyree out of the backfield more, something.