There is definitely a bit of messiah complex going on with him.
If you listen to him talk he explains his role as largely about making players as resilient as possible and maximising their physical attributes so they can utilise their strengths for as long as possible.
I think some people have it in their heads that he has some secret recipe in his head that’s going to magically make us better, in reality he’s just really, really good at his job, and is simply another piece of the puzzle.
He wouldn’t be the puppet master but if the quacks or the player are 50/50 on having surgery I am sure his opinion holds weight.