Very hard to say. Itauma's team dodged Sanchez, which should make one skeptical in picking Itauama in any fantasy fight. My gut feeling is Itauma can blast Young out in the first six rounds if he goes for it. However, the longer the fight goes on, the more confident Young will become and the less confident Itauma will become.
Jimmy Young once said "Never mistake my kindness for weakness, I’m kind to everyone. But when someone is unkind to me, weakness is not what they’ll remember." and anyone who's ever seen him box knows this to be true.
Itauma has never in his life seen a fighter like Jimmy Young because those cute, spoiler guys aren't allowed to exist anymore. They make guys look bad and, in an era when you have been 'exposed' if you don't win every fight in the first 2 rounds, there is no room for that. Itauma may well win the fight, and maybe he won't, but it is very unlikely that he will look good no matter how it turns out.
Even if Itauma proves to be the goods, he isn’t blowing Young out of there, he had an excellent defence and rarely got caught clean.
I'm not sold on Itauma's stamina either yet. He was blowing a bit vs Franklin and that was in a fight he had 0 resistance. I'm not making any predictions on Itauma against past notable Heavyweights until I see the following. 1. His chin tested. 2. His stamina tested in a fight where he has some resistance. 3. He beats a top 10 ranked Heavyweight.