Kerry Strug probably performed that Vault properly 10 times a day getting ready for the Olympics.
She probably could perform it while having to go to the bathroom or if she had spiders thrown at her or whatever

Hanyu's problem with this element isn't an injury, we've seen him compete injured a number of times.
I'd be happy if you're right and the magic of pure adrenalin has us seeing the first ever 4A tomorrow,
but I think these moments are created through hard work and practice, and he can't get near it in practice.