Who are you hearing this from? He is an athletic freak of nature, looks like a grown man now and I believe he has like a 40 inch vertical or something crazy for a 6'10" 245 lb dude. When you are that athletic and can jump like that at that size, I find it hard to believe his lateral movement is bad, maybe so but it will be effort or motor based because you can't be athletic enought to throw 6'10" 245 lb body 40 inches into the air and not be quick... that's fast twitch muscle fibers... ala Zion like. I think I eve recently saw a clip somebody comparing a play Somto had to something zion would do just because of how quick he got to a block that seemed un-reachable.
He's 4 stars for a reason, yes. But I wonder if 10 or 15 years ago he would be a 5 star. Now if you are a big and are not a stretch big you are ranked lower because that's how the game has gone. My point was, I bet Somto right now would give you more than Bradshaw does