Same as Nistor, sometimes these smaller crouchy guys are dangerous to your 6'6" plus outside fighters.
Remember when Cotto lost to Muhammad Abdulayov in the AMs and what happened in the pros? There's a long line of AMs matchups that end up with different outcomes in the Pros. I'm not saying Wilder beats him or the other way around, I'm saying the AMs and Pros are two different worlds.
Romanov looks a pretty sound fighter, punches solidly and likely has a good chin. He's short for a heavyweight though these days. He wouldn't beat Wilder now over 12 rounds in the pro ring. He'll give Deontay a better scrap than Breazeale, I'll say that.