Its almost like at every persons career growth at some point they hit a stage where someone has to smack them in the head and tell them to delegate more.
I'm a software engineer by trade, getting into management guess what almost no coding. want to code ? go be an engineer. similarly to reach higher levels you have to be able to delegate more, hold people accountable, and fucking manage. You can be a good manager or a good engineer, but no one has the capacity to do both.
I think the signal at large here is you want to be a head coach, be a fucking head coach. If you want to call plays, be a play caller. Right now Sark is trying to do both, doing neither exceptionally well, and he needs to decide which of these he wants to be. Either is fine, but he's paid to be head coach, not play caller.
Saban famously focused on process and systems. Sark needs to call up his old boss and ask for some series perspective help. He needs to focus on his system and processes at large, architect the offense but delegate the execution of it to someone he can trust.