I'm still pretty high on this kid. I know he wont come in and start right away, but I think he will get 10 to 15 minutes a game in Big 12 play. By the time the conference play starts, he will have been in a Big 12 weightroom (and hopefully at Hickory Park) for about 5 months. I don't think it is unreasonable to think by then he may have put 10 to 15 pounds on putting him at about 225 to 230. Remember, he is very young and should be naturally filling out over the next couple years (did you see his dad in Fred's photo!?). Additionally, being underweight isn't necessarily a deal-breaker when you are playing just a few spot minutes here and there, its a bigger concern if you are trying to bang with the big guys all game long.
Tsalbo seems to have a high motor and a good base of skills to work with. CFH will get him to where he needs to be, and playing with Niang and McKay for five months straight will only help him learn more quickly.
He should get plenty of playing time in the non-con because McKay will be out and I anticipate we will have fairly healthy leads in a lot of the games. That should help him adjust to the American style and get him used to playing Hoiball.
Again, he will not be a star as a freshman, but as Matt A. said, they will find a way to use a skilled 7-footer.