A reputation is not proof. There are more than a few "great" men who've gotten by on their reputation for past deeds while they talk impressionable young devotees into doing the bulk of the actual work for them, which they then take credit for.
Isn't that pretty much what management does? A good manager will take the credit for the work his team does then hand out credit within the team in for form of evaluations. If said manager is taking personal credit for the work of the team, or any member, or said "manager" isn't the manager and just taking credit for the work of others on his team, then, yeah, that dude needs to be booted out the door.