He has 2 years of growth, with the last being a solid season where an argument can be made that he was the most critical player on the floor. He had a solid reputation for being a key cog. It's a much better jumping off point to start a Jr. season than a full reboot at a different school where he has zero repoire with the fans and the school.
Never called him a legend, he's not yet, but at BYU he could be. There's no other school he could reach that status with only 2 more years to play.