Carlos getting to the Fragment Core could be said to be his stroke of luck but at the same time, a spell of his doom. For a lowly Stage 2 Energy Refiner like he was, getting into contact with something that involved the central unit of a dimension was suicide. Even experts at the level of Stage 5 would probably have no chance to retaliate against the latching of it.
Many might have claimed full exploration of maintained-type Dimensional Rifts, however, none would say that they lorded over the whole Dimension. That they controlled everything. All they would be able to claim was that they occupied it by creating sustainable structures that could house themselves against the dimensional creatures living in it.
Although Aldrin had tried searching for information about Dimensions in the seemingly unending knowledge being sold in the Idle Store, an error returned to him saying that it was far below his level to learn.
