Alright, so your argument focus has changed now, so I'll keep that in mind for this. I guess the point now is Enkidu's powers being too overpowered or not.

Is he overpowered? Oh yeah, of course. Is he invincible and utterly game-breaking? Not in the slightest. There are ways characters can be designed to avoid Enkidu's power, not to mention that Enkidu himself has a couple of fairly striking weaknesses. If you pay attention to what I've said so far, those should be apparent, though for obvious reasons I won't just go blurting them out to a non-GM.

Frankly, Enkidu's just sort of here to battle his best friend. I didn't intend for him to be an active participant, or even engage in much transformation, but when you decided to send a sliver into the fray I had to act in-character. In fact, if you had just let the battle continue, Gilgamesh and Enkidu's fight would have terminated in Gil's victory, because when the two are equal in power Gil's still the "protagonist".

Besides, we have characters with a level of omnipotence Enkidu lacks already present. My claim about your attempted facecrush is that you went into this expecting Gaia to be leagues above Gil and Enkidu, that's all. He's not "invincible", but the issue was that when you sent a sliver in thinking that it would have an edge, you sent out an enemy that Enkidu has probably the best compatibility against out of any other character. Even now, there are ways to beat him, depending on the character. It's up to you to try and find those.

As an apology for apparently annoying you, I won't argue if you decide to have Gaia escape the attempted explosion of him. If you want him to stay and fight, that's fine too, your choice.

Enkidu will stop being relevant relatively soon regardless, as will Gil, though. That'll be explained shortly.