He's a true competitor? Because he wants to win a title in college? Has established bonds with his teammates and doesn't want to let them down? He wants to accomplish a goal he set for himself?
The benefits of Zion doing something special in the ACC/NCAAT and then cashing in for $100M+ in the NBA outweigh the risk of him suffering some crazy freak injury that's life threatening.
I don't disagree with any of that. I'm just answering your question, about how it would compromise a future $100m if he tore his ACL.