Win or lose in football it's always a collective success and failure respectively from board down to players however the person that can make a difference on the day is the coach.
We can talk about luck, divine intervention, injuries etc...but I'll be honest no-one gives a fuck about all that if you don't win, the history books do not remember runners up and you don't get any prizes for finishing 2nd.
If you're willing to throw the blame at the manager for losing 22 matches which is more than fair by the way then you gotta keep the same energy when he wins and wins something significant at that , something that this club hadn't done for 17 years previously.
You value the league form over a cup win, that's your prerogative, cool