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Grand Star Bowser is currently rated as possibly 3-A via black hole.
Such a black hole appeared in Super Mario Galaxy. According to the guide, this black hole was a threat to the very fabric of the universe.
"The fabric of the universe" implies that it did not refer to matter, generally referring to the destruction of the universe at the structural level, which would be a feat Low 2-C, not 3-A.
Besides, this literally reset the universe. So much so that Rosalina and the Grand Star are Low 2-C because of the same black hole.
His tier should be changed from "At least 3-C. Possibly 3-A" to "At least 3-C. Possibly Low 2-C".