I should clarify that when I say burden of proof, what I mean is not actually "proof" (since that would be canon information, like you say), but whether I've found a theory sufficiently convincing.
Well, would you agree that the three possibilities are gave are the only options (at least I can't seem to think of any others offhand)? Which would you prefer and why, if any, out of curiosity?
Re: x -- good point about ks vs. z. It does seem even less likely that it could mean both those, with the exact same rules as English (although the "infinite variety happenstance" explanation works still), but for example, is Xia Zia or Ksia, or something else?
I'm a big fan of the German ch sound, which I usually spell "kh" in fictional languages (so Morbuzakh would rhyme with German Bach in my preferences). Maybe "x" is a spelling of this sound. So it would be Khia. And Vortixx would be a drawn-out kh; Vortikhhh. If so, that would make the Krana Kha vs. Za.
Or ks would still work there; Krana Ksa. Probably the wisest theory is "strict ks" if we assume that it doesn't have the exact same rules as English, to preserve all the Makuta names like Teridax.
There's also the possibility that they don't actually spell all these different things with the same letter in "actual" Matoran, so Xia might be spelled with the Z letter actually.
But then what seperates Xa from Za? EDIT: perhaps they are seperated only by the symbol representing them. Like the homophones Knight/Night.
"kh" for me usually signifies a voicing of the "K', or giving it a little more air than usual. So "Morbuzakh" would be pronounced /MOR-bu-zak(ha)/ as opposed to just /MOR-bu-zak/. If that makes sense.
Edited by darthme, Jun 11 2013 - 11:18 PM.