This storyline reminds me a little of Infinite Vacation, a terrific little miniseries about a guy who teams up with “other hims” from other realities.
In the end, Franklin Richards kills his grampaw to save all the “other Reeds.”
This makes the time stream change again, so that the Reeds who died at the beginning of Hickman’s arc are no longer dead.
It’s pretty heady stuff. Hickman’s run can really make your brain hurt.