Didn't Bryan say his doctors clear him to wrestle?
You are WWE. Literally dozens of former wrestlers have died early deaths from prescription drug abuse, trauma and suicide. You have a team of Doctors and a lead physician, who have strict directives and checks they need to hit before they can clear a wrestler. Your lead physician says "I'm not clearing this guy, and I probably never can" and three other random doctors say "Sure, he can go". What do you do?
You listen to your Doc, who is specifically equipped to make this call. You play it safe.
They would love for him to be healthy. They've been hit hard for injuries and having a guy as over as Daniel Bryan would be a huge relief to them, I'm sure. It is what it is.