Fair question.
In Oz's case, I would say it'll be the manager's fault if we make upgrades and suck next year again.
Because now, Oz knows that some certain studs are not totally reliable and he's going to have to figure a way to make it work.
Nobody on the team outside of Bobby was reliable this year.
All the veterans sucked or were very average, and Oz will need to develop a strategy next year realizing this is no longer a WS team.
He deserved a free pass this year because who would have known the veterans were human and the acquisitions would suck?
If the bullpen is this bad next year, though, that will be KW's fault and he should be the first to be fired.
You are right though, if next year this team continues to sleepwalk and suck, Oz probably will be judged harshly and may even get axed.
I think next year is a make or break year for Ozzie and KW.