About zinorge and mizutsune

So it's pretty much guaranteed that these guys are going to come as a TU of some kind. Not sure if anyone has mentioned this before but what if they aren't coming as their "base" version but Instead they come in as guardian monsters. This could be the reason why they're getting added later, to add more content to the endgame.

Of course there's always the chance that like world and rise before it, these guys were meant to be base but couldn't make it in time with deadlines.