I'm sure that there are a lot of NFL assistant coaches with Super Bowl wins, but those are group wins that nobody keeps track of. People who coach sports teams are ranked/graded on their records as the person in charge, not as assistants with much less control over the entire team and the associated outcomes, just like ships captains and business CEOs who are also held accountable for the ogranization's outcomes.
Then it stands to reason that unless a head coach wears the multiple hats of the GM, Player Personnel Director and Owner, and of those who have the control over the franchise's checkbook, all draft choices and free agents they must be given the same leeway.
It takes a combined team effort to be competitive in the NFL. From the ownership suite all the way down to the condition of the practice facilities.
You can only play cards with the hand you get dealt. Some are great, some will make you consider folding.
