That's not how things work at McKinsey (current employee speaking). It's a partnership and partners take the hit when there is one to take. As a recent example (2020), in response to the difficulties stemming from the COVID 19 crisis partners compensation was massively reduced, but no one else's comp at the firm was affected.

As for the consequences of the current opioid-related debacle, it has been communicated to the firm members today that any economical consequence would be borne out of Partner's comp, as is usual.