Board Thread:General Discussion/@comment-6527064-20131214113625/@comment-24605978-20140805124944

But, Ben doesn't need to change his arms into swords. The reason why Kevin could do it was because of his Omasion powers (I haven't watched Ben 10 in a long time.) and that he could transform his body parts and absorb power still. Ben in the meanwhile, he can't because of him being only a human, but in this case, Diamondhead isn't a fusion of aliens, so that might also be why Diamondhead can't do those stuff.