The Org had to "control" the AFs/AEs, especialy due to their appetites:
so the Org even physically "sewed" their eyes and mouths shut, as well as mentally-yoki-Soul Link have control over their brains/minds...keeping them from eating anything/everything.... somehow....
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human + normal yoma flesh = Claymore
human (Clare) + Claymore flesh (Teresa's) = experimental Claymore (at 1/4 yoma, instead of 2/4 yoma)
Claymore + Awakening = An Awakened (Awakened Being-AB or an Abyssal One-AO)
female human + Awakened Being (AB) flesh = female Abyss Feeder/Eater (I like to refer to them as the opposite of Clare, being 3/4 yoma). they "skip" the "Claymore stage". there is no male AF/AE seen yet. All are scantily-clad females, hehe!
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in a 1 vs 1, the AOs are superior to the AFs/AEs, but not by that much... and definately not when its 1-2 vs 11 over and over again with them gaining more and more combat experience and knowledge against their prey/target... hehe
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Yes, the centaur awakened is Isley. there's no other being with a centaur Awkened form, lol (except for possibly Clare's legs... as they seem similar or are at least hoofed like a horse's)
yes, Isley-centaur is Isley-centaur, lol.
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the AFs/AEs *NEVER* release yoki, as far as we know...
there's one scene where they might have... at least if they were... we've never seen a further increase in their POWER... lol...