Bad stylistic match-up for Hall, I understand why the odds are where they are. Topuria is younger, more explosive, and has a competitive Greco-Roman wrestling base from growing up in Georgia and Spain. He has recently shown himself to have some serious hands on him after beating Zalal and Jackson in largely standup fights. Not only does he have plenty of power in his fists, but is able to uncork loads of accurate, high-variance head & body combinations and has pretty crazy hand speed to boot.
And finally -- on top of all of this -- he actually began his career as a high-level submission specialist and is a legit BJJ Black Belt. His first seven pro wins were all submission finishes via a myriad of different techniques: triangle choke, RNC, guillotine (both mounted and conventional), anaconda choke, and a triangle straight armbar. Now a couple of those opponents had 0-0 or negative records, but some of them were pretty legit guys on the regional scene with more experience than him when Topuria finished them (6-1, 7-1, 8-1, etc.). This isn't to say that Topuria is going to be able to go to the mat and play the ADCC game with Ryan -- I absolutely don't think he can -- but only to say that between his obvious knowledge of the BJJ meta as it applies to MMA and his scrambling ability from his wrestling base, he shouldn't be a total fish out of water should the fight briefly go to the ground or should The Wizard get a hold of him. Other fighters have shut Ryan's attack down before with solid game-planning.
That said, Ryan is always a live dog. It legitimately only takes one mistake in a grappling exchange with him and you're tapping. Even if Ilia stays safe from that, I can see Ryan's unorthodox, long-range kicks from the outside frustrating his pressure-heavy, boxing-oriented game. He might not be able to get in on Hall and get picked apart, especially since he doesn't throw all that many kicks of his own. I wouldn't bet on it, but it's a viable outcome I could see happening.
Fun fight. I like both guys so it sucks from that angle, but I'll enjoy it as a fight fan from a stylistic perspective seeing these two clash.