Every team and individual have their own norms, but some people just take the agency to get shit done. In other words, when there’s work to be done they don’t feel the need to ask permission.

Can't OP do the same then instead of waiting on a team member to burn out . I think OP is barking up the wrong tree because the problem seems that their manager doesn't believe in them or maybe OP doesn't believe in themselves to step up and take responsibility .

I want them to do less and let the team fail instead of personally holding the team up. Our team needs to fail and learn lessons but this individual is so astoundingly good that they can carry us.