I would dispute you just a touch. Hawkeye and Widow initially traveled with Rhodey and Nebula to 2014 Morag. After arriving on Morag, they unshrunk the ship, pulled out the pod for Rhodey and Nebula to have (if needed) and Hawkeye and Widow went in the ship to Vorimir (Nebula had pre-programmed the coordinates/auto pilot to take them there). So your Timeline #2 & #8 are actually the same branched off timeline. Same thing with 3, 4 and 5. Tony, Cap, Hulk and Ant-man all made the same initial jump together to 2012 (this was the point of Nat realizing that "if you pick the right year, there are 3 stones in New York"). It's this same timeline branch that Loki steals the space stone... so also your #6 event is already a part of the branched off timeline (he doesn't jump through time when he steals it... he just uses it to escape his predicament - so he doesn't create yet another branch).
So I'm going to use letters instead of the separate stones and what not.
- Timeline A/Prime Timeline - the whole of the MCU to date. Currently in the year 2023 (5 years after The Snap)
- Timeline B - Branch off of the year 2012 - Tony, Cap, Hulk and Ant-man travel together to steal the Mind, Time and Space stones during the Battle of New York - during this branch, Loki steals the Tesseract and escapes. Mind and Time are successfully retrieved
- Timeline C - Branch off of the year 1970 - After failing in 2012 Tony and Cap use their time GPS to travel to 1970 New Jersey to get the Space Stone from SHIELD as well as recover additional Pym Particles
- Timeline D - Branch off of the year 2013 - Thor and Rocket travel to Asgard just before the Dark Elf invasion to steal the Reality Stone (which is inhabiting Jane Foster at this time). Thor also takes Mjolnir
- Timeline E - Branch off of the year 2014 - Rhodey, Nebula, Hawkeye and Widow travel to Morag where they further split up. Rhodey and Nebula knockout Quill and retrieve the Power stone from the building it was kept in. Hawkeye and Widow travel via space ship to Voromir to retrieve the Soul Stone. During their attempts, Thanos of this branch becomes aware of travelers, abducts Timeline A-Nebula and using his Nebula infiltrating the Avengers, travels himself and his army to Timeline A.
- Timeline F - Branch off of some year in the 1940's - After returning the stones to the timeline they were taken from, Cap jumps further back and lives life with Peggy.
After returning the stones (however he did it, whether the Time GPS's were able to keep log of the 'temporal coordinates' of the newly branched timelines or what). Timeline C & D are likely the only ones to *maybe* return to a "close enough" state to Timeline A (IMO, despite what Hulk said/implied, there is no truly erasing them, simply the act of time traveling to them, branched them off) - as Cap returning the stones (as well as returning Mjolnir to 2013) should keep things mostly intact.
So we have:
- Timeline A/Prime Timeline
And then in terms of remaining *significantly* altered timelines (ignore any that were returned to "close enough" to A)
- Timeline B - Loki had escaped with the Tesseract, so this remains a significant branch off (not to mention, you now have Hydra/SHIELD agents that think that Cap is Hydra and a Cap that has been told at this point in time, not finding out 2 years from this point, that Bucky is still alive)
- Timeline E - As you say, lack of Thanos & crew - so significant branch off
- Timeline F - Eventually Cap returned to Timeline A, but because of living life with Peggy (and who knows what else he did, personally - I don't see him sitting on the sidelines when he knows he has a chance to stop Hydra infiltrating SHIELD, or rescuing Bucky sooner (which might prevent Howard and Maria's deaths, etc...) this remains a significant branch off
(and sorry if I went into that more than I needed to, I'd been planning on typing it all out at some point...eventually)
