Callahan was awesome when he could COMPLETELY run the offense, which he did in the late 90s at Raiders without somebody overhead like Garrett, himself an OC, looking over his shoulder. Awesome Top-10, Top-5 numbers on offense for a few years there.
Callahan as has been said was a great HC at Oakland his first year (SB year) then there was a mutiny but there were lots of injuries and guys like Tim Brown that just want to blame him for all the Raiders' failures. As Callahan says himself, he's not the most personable or rousing speech maker for players. Maybe neither is Marinelli, Marinelli might be thought of an awesome person over time himself in the eyes of the players no matter how good he is, and Marinelli's head coaching record also wasn't good.
But at least Callahan should likewise get the chance (like Marinelli) to run the offense completely without the influence of Garrett and see what happens.
Callahan was fired so fast that Tim Brown (Tim Brown hated him) was maybe wrong - we'll never know if it was Callahan's fault as HC. Was it Callahan, Al Davis, player mutiny etc., we'll never know.
All you Garrett lovers, the Parcells test should be applied:
"Does he have proven/demonstrated ability?" Parcells used to ask, regarding a player, whether a guy on your team has ever done it, or can do it?
We have to apply the same to Garrett.
Garrett is neither good, nor bad so far. As an OC and coach he's been relentlessly average. Very predictive, don't you think? ... Middle of the pack in scoring offense. Middle of the pack in record. Every year. (Except 2010 when he was 7th as OC scoring offense - the year we went 1-7, fired Wade, Jason was interim coach .. I guess we were so far behind most games that we marched up and down the field and made points ...)
I'm like ChocolateLab on this board. We both have strong reservations about this guy.
Because Garrett's a strong note-taker, studies every coach that will tell him their secrets (probably not very many), flying to Durham and asking Coach K his secrets etc. and everyone else. A hundred or more spiral notebooks like we used to have in school, filled in with ideas, filled in by Jason.
But if you are a note-taker, it probably means you don't have much insight or strong opinions. You are searching.
Garrett is a note-taker. Smart guy in ways, but if he was one of the Harbaughs he probably wouldn't have had to take many notes.