As far as I am concerned, half of the Might in Ull'Yang's possession is no-limits. Reserved only for rebirths and Avatar deaths. The other half would be the might that Ull would use. Now, as far as the whole, rich people can annihilate poor people: I think that everyone here is mature enough to not do that... If there is no justification ICly for a rich god to use all of his might to overpower another god/annihilate his creations then why even talk about it in the first place? 

Now, I would be in support of a Might Cap. Say, for example, 50 Might. That would be the utmost one god would be able to store and when it is reached, the said gods Holy Sites instead of generating more might for him, they would radiate the divine essence to their surroundings and enhance them, change them for the better or worse

That way, the gods would have to constantly spend might so that they won't lose on any extra mp that would go to waste if they were capped. This way we could also leave the inactive gods MP pools alone and once they get capped, we can use their Holy Sites to further the plot of the rp. 

Maybe Mammon's Holy Site overloaded and the excess might mutated his worm creatures, creating unspeakable horrors that Liprasil could later go and kill.

That kind of stuff.

These are my two cents, take it as you wish.