Well absorbed Bee's TBB with ease that's why kinda not impossible imo. That's why I said other than ash bone he should be able to absorb everything she have. Unless there is a limit to what he can absorb which so far haven't been the case.I highly doubt he could absorb something much, much larger than a regular bijuudama. Kaguya could just put him down in the gravity dimension and shoot an ash bone on top of him via her ST portal while he's pin down by the heavy gravity. He isn't absorbing something going right behind him so GG.