If Njoku stays and improves his run blocking, he can definitely be a 1st rounder. If he leaves early this year, I'd think he'd be about a 3rd-4th rounder right about now.
Njoku will be back ( I am not in the least bit concerned this year about him leaving as he wants to play one year with his little bro and he will be a 1st rounder next season and is at best a 4th rounder now ) and he will be the best TE in college next season. He and Kaaya next year will run things.