I do remember feeling confused when reading that chapter since it implied the sealing of the higher floors was more of a group decision when it has been implied that Zahard himself sealed the 135th floor then split the key... if it was a group thing why did the FH have to decide to either support Zahard or V when the latter wanted to continue the climb.
We know there's more than an axis since Phanta is considered top 5 amongst his kind but the outside god has always been referred to as a singular entity by Enryu and Rachel. Theres two options: either Phanta is indeed the outside god or the outside god is an actual deity since he can affect the fate of the tower which should be the domain of phanta himself.
I would like the second option to be true