I'm not downplaying Gardner's impact and how elite he was, but again, it's not like Bryant was crap and won the award for being crap. Again, also, the NFL talent Fickell developed in a short time there was apparent. He got to Cincy in 2017, and for the next for the next 3 years they had 1 player drafted in each draft. Then in 2021, a class almost entirely developed by Fickell, they had 4 drafted. In 2022, there were 9 that got drafted. There were then 3 more drafted this year. That's 16 kids over 3 years, with 6 of them being drafted in the early rounds. You can't just act like he got lucky with 1 player and that's all he did.
For Longo, I didn't actually realized he was classified as "air raid", which doesn't make any sense at all. UNC ran far more often than they threw during his time at UNC, with 2022 being the only season they had more pass attempts than rush attempts, while typical air raid schemes throw normally 65+% of the time. They also had 3 different RBs run for 1,000+ yards during his 4 years, so I'm not sure it's some wild departure. It might not be elite the first couple of years, but let him recruit his guys in. I see no reason it can't work.