More data on Staley's departure from the Chargers

"Failed" is a bit harsh... he failed to win a super bowl but a .500 record and a playoff appearance isn't necessarily a failure IMHO. Dennis Allen on the other hand...

Let's all hope he can put a respectable (hopefully dominant) defense on the field. It might take a year or 2 because he doesn't have the pieces.
Yeah, not sure why you read so deeply into that. A successful tenure as a head coach means he's likely still a head coach. Perhaps the word unsuccessful would have been more to your taste, regardless it wasn't meant other than the actual definition for failure

noun: failure
  1. 1.
    lack of success.
    "an economic policy that is doomed to failure"