I think you are way too optimistic on Foster being a 1 and done. He is a Iowa HS 3A big man. Sure he has played AAU, buy AAU is glorified Rec Ball. Foster will have a big adjustment to be an acceptable Big12 defender and adjust to the physicality if the game. He will have to play against posts his size that could be 3-4 years older.
Would love to see Foster start, but realistically playing 15-20mpg would be a great freshman year.
I hope you're right. It's just that he's 7', athletic, and can shoot and handle the ball. He'll have people in his ear just like they were with Tucker. If he were to stay 2 years it's scary to think about how good he would be.