On his best day, I see Bonecrusher forcing a late stoppage, or a close decision (
It's difficult to see Tua being stopped here, even though Bone looked like a real monster for 3 or 4 fights until he met Tyson.
But if Crusher could last 12 with Mike (and last he did) he would probably manage to do so with Tua.
In my mind, the result swings on how negative Bonecrusher behaves. Lets not forget that he did open up on Mike when he was sure that there was no time left for Tyson to respond! This is what my head tells me.
My heart sees an all out war from bell one, which might just favour Tua? Whatever, I'd pay to see it.