This years offense was largely residual players originally recruited for skillsets that fit an offense Sark designed for the B12
The offense shredded Bama last year because Saban tailored his 3-4 to defend Georgia, which meant leaving DB's in man on inferior X and Z receivers while the rest of the defense focused on the run and defending areas attacked with a slot/TE(Bowers and McConkey). And those same DB's had a 0% chance of holding up in man vs Mitchell and Worthy
Meanwhile that same offense would have been dumpstered by Georgia, just like this year, as Kirby's 3-4 was crafted to shut down the pro-style spread run by Bama with Mac Jones and Bryce Young, which Sark recreated with Ewers
Saban responded by switching to Milroe, a strong mobile QB with an elite deep ball + explosive WR capable of beating the press completely breaks Kirby's defense (see game this season and why every running QB torches Georgia), while Sark tried to make the impossible work with Ewers
What's happened to Ewers is the same thing that's happened to Bryce Young. Their skillsets were great fits in certain systems, but those offenses have not only been made obsolete by Kirby, but also by new variations of the nickel that rotate dline personnel capable of exploiting both the run and pass, while incorporating hybrid LB/S like Jonah Williams who can both cover like a 5th DB and provide run support of a 3rd LB
And given the nickel(4-2-5) is now overwelmingly the dominant base defense at the NFL/top collegiate levels and a strong armed mobile qb(hello Arch, but a new offense has to be installed)/power run game is the only way to counter it, the game has effectively passed Ewers by. This is also why Milroe will be a 1st rounder and Ewers is virtually undraftable