Board Thread:General Discussion/@comment-26838855-20190803131136/@comment-28529249-20190811034019

I agree with BEJT. Shabook's explanation works but there isn't anything in the show that would point to it being true. It should be treated as a theory.

What we're shown is that all the agents (including Fitz from different means) travel from the present of Earth-A to the future of Earth-A. Then, they come back to the present of Earth-A some months after they left, and then create Earth-B which is now the main MCU timeline. We're also shown that the agents had already tried to change Earth-A's future but failed and were stuck in a time loop until they managed to split universes in the S5 finale.

I don't see why you would think the monolith transported them to an alternate universe future, instead of just the future of their own universe. Unless you have a source stating that, it would just be speculation.