Board Thread:General Discussion/@comment-26838855-20190803131136/@comment-112155-20191203205447

The Coulson copy that became Sarge was not "sent" to the past.

It was a copy created in a different time and place due to the interaction with the energy from the three monoliths. Therefore, same universe.

Time travel from season 5, different universe. Even Deke acknowledged it in-universe.