So if I understand what you're saying, a universe devoid of the maximally undescribable entity contains less than the universe with it.
For the word "universe" to have meaning, it must stand in relationship to something else.
Since "universe" signifies all that conceivably may exist, which necessarily includes however many parallel realities there are even if they are imaginary and/or indescribable from our vantage point, the maximally undescribable entity must be the same for each cosmic vantage point whether at remote locations in the cosmos we observe or in some other cosmos altogether from which perspective we ourselves would be the imaginary and/or indescribable reality.
In that case, multiple disjunct bubbles would be less than multiple conjoined bubbles since the conjoining phenomenon would be something extra. Similarly, multiple conjoined bubbles themselves interspersed with other multiple conjoined bubbles results in multiple conjoining phenomena which
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.if I haven't misunderstood your model
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.renders those conjoining phenomena describable.
If they're describable then a portal opens to the maximally undescribable entity in paragraph one. Since its existence has results
viz. the conjoining, the entity is not only undescribable but active.
I expect this is where atheists start raising topics like "albino ravens" but these are very easily refuted. If there were only one cosmos it would be synonymous with "universe" and the maximally undescribable entity could have only one effect. Creation.
John 1:1-3 In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by him; and without him was not any thing made that was made.
The next stage is not multiple multiverses, seriously turtles all the way down? but intricately unfurling creation where multidimensional surfaces become self aware. This is not only inexplicable but undescribable BECAUSE any description of the process itself needs to be explained. It is maximally undescribable, separate from the void yet expressed within it. And there can only ever be ONE maximally undescribable entity.
John 1:4-5 In him was life; and the life was the light of men. And the light shineth in darkness; and the darkness comprehended it not.