People are seemingly putting way too much stock into team win totals under an AD. AD's have a few broad roles: hiring/firing coaches, ability to extract resources from the university to put into the athletics program, ability to sell the program, ability to negotiate contracts on behalf of the program, etc..
When it comes to hiring/firing, the truth of the matter is, hiring a non-P5 head coach or coordinator is a crapshoot. We've seen the next greats fail pretty spectacularly (e.g. Herman, Frost). Every single Georgia fan was clamoring for Herman and weren't all too happy when they got Kirby. UF fans were elated when they hired Muschamp. Do you fault Texas' AD for hiring Herman?
Firing a coach requires balls and aggressiveness. It's hard to fire someone you know well and have worked closely with for the last however many years. But the great ADs are alpha's and don't let their personal relationships cloud their objective judgment. For example, at the time, most of us didn't hate the Golden hire because it made sense. What we hated the most, however, was granting Golden a year 5. But it gets more complicated than this. Sometimes AD's don't have ultimate authority. They may want to fire a coach, but may not have the backing of the BOT for political or financial reasons.
So who do you an evaluate an AD? The main factor I look at is: did the hire make sense at the time? Manny was a meh hire in my opinion. Richt was a worse hire in my opinion. Richt couldn't win at Georgia (and was fired as a result) despite the abundance of resources and in-state talent. That was a huge red flag.
Another factor is, does the AD have the vision and salesmanship to land a big fish? Big fishes, meaning successful P5 coaches, are way less riskier than non-P5 coaches and coordinators. This of course requires financial backing from the University, so an AD might have the skills to land a big fish but might not have the money.
So what does this mean for Nunez? People keep citing a basketball record based on one hire he made. But we have no idea what his budget was. We have no idea if the hire made sense at the time. Etc.
But reports from Nunez's time at LSU makes it seem like he has impressive leadership and oversight skills. He gets assigned a project and it seems like he gets **** done. That's says a lot more about Nunez than whether the basketball hire he made turned out to be good.