Nothing impacts a Defense more negativiely than a slow paced 3 & out Pro style bro offense.
LSU, Clemson, Oh St, Bama, Auburn, Oregon, Penn St, Minnesota, SD St, Cal & Lousiana are all teams that run different variations of Uptempo Spread & maintain good Defenses.
I think you could be confusing Mike Leach's Pass only Air Raid with uptempo Spread. It's virtually impossible to field a good Defense when you throw the ball 80-90% of time, but our offensive system will be way more balanced than that. It'll be a 55/45 or 60/40 percentage for pass/run ratio, you can run the ball while still going fast paced. Tempo isn't just about throwing the ball every snap, it's about moving the ball quickly in both the pass & run game to keep defenses off balanced & not allowing them to substitute into different personnel so as to catch them off guard & create mismatches out of different offensive looks & wide splits.
Our Defenses problem will not be the offense being too productive or too fast, their issue will be about fixing the secondary & ensuring that the LB corps can maintain discipline & gap integrity.
The Spread offense is not a bad thing, it's literally one of the best things to ever happen to college football, our fans are just so used to Pro style bro that people think Spread is some kinda contagious incurable disease lol. Every major winning P5 program in college football runs some form of Spread, we're literally one of the few schools that don't up until now.
We've been behind the times for the last decade plus, we're just now catching up.