I was rewatching Endgame and thought about the Tony that gets knocked out due to AntMan. I think THIS Tony might become Doom. They did say theyre connected and the reason why i think its him is this:

-We see Loki go to another part of the world in the same timeline but it gets pruned. Depending how long it takes, Tony may have had time to figure out why his chest piece malfunctioned. Loki leaving was the turning point for doom to come back.
-Tony looks into this and realizes it wasnt his suit or tech that failed but an outside factor so he begins digging like tony does. -He reviews footage and uses jarvis to help see literally himself and captain america walking through and around the building. They could probably even see them walking through the city. Im sure nick furry watched ALL of the footage from that day or had people doing it. This could also include nick fury looking into it as well especially when captain america talks about loki the picture of peggy which wouldnt make sense.
-In this same timeline, hydra would assume captain was on their side and might brain wash him to be captain hydra especially since he now knows bucky is alive early.
Thats a side theory. Anyway, after tony and nick furry realize or theorize that they are from the future or another timeline which leads tony down the path of learning time travel or dimension travel. Before his reality is destroyed, he meets a kang variant and they use his machine to leave and thats when they end up in the FF universe.

Basically: the altered timeline causes the heros to learn things too early which causes variants to emerge and they havent had the proper character development to fully address these new changes. Chances are, this isnt what they are doing but it would be interesting to see this

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