Ya know, I don't really care. He could sing it with the identical phrasing and melody for all I care because he does it much, much better than any other Anthrax vocalist, whether that be Turbin, Nelson or Bush.
Had they released this album with Nelson singing, it would have bombed. Crashed and burned. Had they released it with Bush, it would have done a bit better but still would have bombed. And neither version would sound good either.
Belladonna is the classic Anthrax vocalist. It doesn't matter whether you agree with it or not. Most Anthrax fans and metal fans prefer Belladonna and that is just the way it is.