Not much. The offense was not the root of the problem for Golden. We actually recruited a lot of good offensive players and produced some solid offenses. But as was mentioned above, Onofrio was the problem, almost entirely.
2011 offense YPP -- 29th, Scoring offense 65th
2012 offense YPP -- 15th, Scoring offense 46th
2013 offense YPP -- 15th, Scoring offense 48th
2014 offense YPP -- 10th, Scoring offense 59th
2015 offense YPP -- 44th, Scoring offense 76th
My point here is, the offenses during that period routinely moved the ball very well. 3 years in a row in the Top 15 in yards per play. But scoring was not great, and the reason is because of our long-endured national nightmare known as the red zone offense. We were routinely in the 90s and 100s in red zone TD % back then. So, does Brissett help with that? Maybe, although I'd argue it was more coaching than anything else. But back to the discussion at hand, overall the offenses were not putrid. The defenses, on the other hand? Big yikes:
2011 defense YPP allowed -- 61st, Scoring defense 18th
2012 defense YPP allowed -- 100th, Scoring defense 86th
2013 defense YPP allowed -- 82nd, Scoring defense 69th
2014 defense YPP allowed -- 17th, Scoring defense 43rd
2015 defense YPP allowed -- 92nd, Scoring defense 84th
So, unless Jacoby Brissett was going to be calling the defense, no, I don't think it would matter very much.
One last point just to make everyone feel even worse, we ran a VERY slow offense during this time period overall. So the offensive PPG is somewhat limited due to possessions, and the defensive PPG is inflated. Less possessions, less plays, less points. So even though those PPGs by the defense aren't the worst in the country (they're close), a lot of it had to do with how slow our games were. BUT THAT BEING SAID, times giving up 30+ points in those 5 years:
TWENTY-SIX. In 5 years.
For comparison's sake, times giving up 30+ points in the 5 years with Diaz here:
FOURTEEN. In 5 years.