I'm sure there are some Labrie 'clones' out there. I like what Priest did by getting Ripper. He's very comparable to Halford. Only, the music was just so different, that didn't help peoples opinions on him. Although, looking at Painkiller, Jugulator is just a step further, really. but that's another discussion altogether ;p
I really wonder what they'd do if James decided to leave. Would they keep going as DT? If they got a new singer, how would it change their music? I wonder. James has a very operatic like quality to him, that really is quite unique. I can't think of anyone comparable to him. (although, like i always say, i prefer when he sings aggressively, but i must say his emotion of Looking Glass is fuckin beautiful. Makes me cry man tears. Well, not really, but whatever....)