Billy Napier, Hugh Freeze or Tom Herman.
I think Napier would be the best in terms of long term program building, he built that ULL program into a competitive winning team. They had only had 2 9 win seasons in their entire program history & the last one was in 1993 before he got there. He also came up in the Clemson program under Terry Bowden & was there at the beginning of the Dabo era, he also was at Bama as Saban’s WR’s coach & recruited Calvin Ridley, Jerry Jeudy, Trevon Diggs & a bunch others. He’s a smart young guy that is noted for having a great attention to detail & learned under Dabo & Saban & has built a rep as a highly respected coach that is the next young potential star on the coaching scene.
He would also fix our run game because he does a good job recruiting OL’s & his offense is predicated on a power run scheme that takes the air out of the ball & wares the Defense down.
Freeze imo would be a great pick as well as a quick turn around coach, he’d have the offense up & running from the day he set foot on campus & would no doubt find us a big time QB either in the Portal or would recruit one. Obviously he can recruit too lol, but I think he’d a be a great fit here to get us back on track in the short term, i don’t think he’d stay for longer than 2 seasons though, as soon as a SEC vacancy opened up I think he’d be outta here. But I would still take him.
Herman would be an upgrade from Manny clearly & I think we’d win the Coastal with him, he’d definitely have our QB play at a high level & the offense would be good, but our Defense might suck under Herman lol. He has probably the most question marks about his ability to inspire his team & get them to play above their means, for as talented as Texas was they tended to play down to their competition sometimes under his tenure, but they also got up for big games & showed out in Bowl games. He’s a good coach, another offensive x’s & o’s guy that would have us right in the passing game, but again, our Defense would be contingent upon him finding the right DC.
I think any one of the 3 would be a good replacement for Diaz, I like Napier & Freeze a little more than Herman but would be good with Herman still.