If instead of merging and compressing worlds into one planet, he made multiple planets in a singe or more solar systems (since there arent any aliens in that universe) it could have been more logical.
Its hard to imagine thousands upon thousands of planets merging into one. I mean where do you put all that land and sea, not to mention population. If one fused that many worlds, its impossible to compress and will result in a planet billions of times larger than a super nova. Its more logical to just destroy the dimensional barriers separating them and join in one universe butdifferent planets instead.