Last I'd heard, Tua was rethinking this one.
It's still listed on Boxrec, but I heard Tua interviewed after his last fight, and he was talking like he knew he wasn't ready for a step up in class yet.
He looked dreadfull in his last fight. He rarely landed a single hook, and chased his opponent around the ring with a double jab, never hurting him in the least.
Brock would embarass Tua.
He's dull and rusty and won't be able to mount an attack.
I am sure Brock can beat him but it depends on if Tua really shows up or not....he is pretty one dimensional so Brock should win a UD as long as he can keep from getting KOed.
Brock is a decent boxer. That's all you need to be in order to beat Tua these days. Tua rarely moves his hands. He'll just wait & wait while Brock piles up the points.