X does not need a macho voice... It's just not him. I hate that people think he should HAVE that kind of voice. I love Mark Gatha's performance in MHX the most because of the fight against Sigma.
Zero, to me, can have two different type of voices because I kind of think that he might have two different personalities (not schizo or anything like that...). One side has Lucas Gilbertson's voice and has that surfer-esque tone to it. The other is the uber-hot deep voices of Zero's Japanese VAs. But, CM, I think Gilbertson was still experimenting and then nailed it with Zero's getting injured in MHX.
I see if that way. I think by MHX, they had it perfected it pretty well. I like how they did X8... Though Gatha saying 'in an attempt to destroy the world' just makes me giggle.