John’s team might also be taking more calculated risks and running circles around Sally and Mike’s teams with respect to innovation and execution. If your organization categorically punishes failures/outages, you end up with timid managers that are only playing defense, probably the opposite of what the leadership team wants.

Worth a look, certainly. Also very possible that this John is upfront about honest postmortems and like a good leader takes the blame, whereas Sally and Mike are out all day playing politics looking for how to shift blame so nothing has their name attached. Most larger companies that's how it goes.

Or John's work is in frontline production use and Sally's and Mike's is not, so there's different exposure.