Yeah it will create an alternate 2014 timeline. where quill got knocked out, so no guardians, 2014 gamora: fate unknown, 2014 nebula: dead. No one to stop Ronan so: Ronan takes over xandar, no Thanos so: events of infinity war and Endgame never happened. Etiri and the dwarves still alive. Asgardians still alive after events of Ragnarok. And Loki's alive in that timeline.

Thanos destroyed Xandar as a result of GOTG. GOTG gives the power stone to the nova Corp on xandar. This is the first stone Thanos retrieves. Even if he didn't outright destroy it, he at least would have wiped out the Nova Corp and killed half the population.

The whole concept of the Multiverse seems to go over everyone's heads so let's simplify. Regardless of when the stones are removed, whether it be when Thanos destroys them or when they are taken from another time it created the multiverse as explained in endgame by the sorcerer supreme. She never actually agreed with Banners plan to return the stones, she just heard Strange gave up the stone for this reason and trusted him.

Simply put, it allows for any possible conveived future exists. There is a reality where infinity wars never started. A reality where there are multiple copies of a single hero. You describe any possible scenario or reality with as much detail as you want, it exists in a different universe.

Flerken has an interesting way to put it and I’ll say it’s pretty confusing lol. In one hand, there really is no more Thanatos. 2014’s was killed by Tony and 2019’s was killed by Thor, even if he had “won”. So really Ronan would naturally still be alive and take over Quills planet just like some other person on here was saying so maybe when quill(2019) and his team go back to his home, it will have been taken over Ronan is Who they fight again on guardians of the Galaxy 3(this is just a theory however!) kinda cool but also confusing to see how that would change things. Not even sure what will come of 2014 Gamora now. Very interesting.