Good point on Thanos. But that just makes it worse. The problem then becomes the fact that the magic red potion was presented as one vial = one person. So how did one vial bring an entire warship and innumerable troops forward in time? If one vial can move that many people, then the Avengers had plenty of red potion for multiple trips. That's really the kind of inefficiency and waste that Banner and Stark should have avoided.
Also, given how many big brains are in the group, someone should have clued into "oh hey, we can save Natasha the same way" at that point.
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