I'll admit I didn't see all 49 minutes Thiam played, but I saw absolutely nothing in the minutes he had that indicated he will be ready to play in the Big 10, at any point. I realize many kids make an unexpected big jump in college, but it would have to be a night and day improvement for him to get to the point where he makes even a small positive impact. TT got more minutes because we were so thin up front, and he struggled, but he also showed some flashes of talent. He's also tall, so you give a lot more rope to a big guy. Short guards who are turnover machines are easy to find... I'd encourage Thiam to leave if I was BJ.
Also, I hope I'm completely wrong and Thiam is all Big 10 in 3 years.