CAW callnames are handled differently than regular ones. They can only be used with CAWs. Only announcements that are tied to the Wrestler ID can be used with the Wrestler of thevsame ID. Commentary ID is separate and can be changed to a different one, but obviously only ones that are in the game and tied to the chosen ID already. Even though Kenny Omega may be in the list, it's just a reserved ID slot in case somebody figures out how to actually add new commentary to slots and releases a mod for it.
Not sure if somebody created a Wiki article on it, if no, check out the Sound Editor thread. Replacing commentary is basically thevsame as replacing entrance music, you just need to find all the right sounds in Sound Editor to replace.