Why doesn't stunna publish a list of Hufflepuff's PrimeDice alts so we can see if any of them match any forum handles?
That would probably not do any good. Even if he was using any of the alts, the chances of his identity being known through any of his accounts is very less. And even if does become known, there would be nothing Stunna would be able to do against him. Specially when there is not legal help that he will get.
I don't see any downside to releasing the alts. If/when their RL identity is discovered then stunna could sue them to recover damages for the Bitcoin he stole.
Sue him how ? Primedice or any of the gambling sites aren't really licensed, so even if he figures out the identity, he will not be able to take any legal step towards the person, Specially because in this case , that he was taking advantage of a flaw or something on the casino site.