Who can he spar though ? it's not like there's been many elite Southpaws in Heavyweight history especially with Usyk's skill set. I guess Luis Ortiz would be the best opponent he could spar as Ortiz is a skillful Southpaw.
He’s building the fight, don’t be so naive to get taken in by it all. It’s a very good question - stylistically Usyk is fairly unique as is Fury. Perhaps the opponent Usyk struggled the most against - Breidis.
Mairis Briedis and Krzysztof Glowacki. Really though he doesn't need to do any sparring for this one. Sparring his brother Tommy Fury might be a good idea.
Jalolov would be a great sparring partner. He's a southpaw with good movement. Wallin ain't bad either.
Jai Opetaia That is the only option here. Not only is he a decently paced southpaw but he is the one other cruiser besides Usyk that has beat Briedis