According to Heath's notes, the Kingdom of Allstars acts as a cage that will eventually trap the Angel, but there's a 'digestion' process during which the Dazzling Star Magic Master assimilates the Angel, unable to immediately seize the ruby angel's authority.
As for why other Divine Lords allow the Ruby Mountain to be sealed, watching as the Dazzling Star Magic Master captures the Angel, rather than saying they 'don't know' or 'cannot intervene', Ash is more inclined to believe that hunting angels involves the common interests of the Divine Lords, making the Dazzling Star Magic Master's progress so smooth under their tacit approval.
But as the Angel rots within this pot of the Kingdom of Allstars, the conflicts among the Divine Lords immediately become apparent—why shouldn't I be the one to consume the already-prepared meal?
For thousands of years, we let you create a cage to imprison the Angels, shouldn't you now repay this favor?
