3. How did past-Nebula get Thanos' ship through the portal if she used the return batch of Pym-particles for herself?
I don't think one bottle equals one trip. When Scott says they have enough for everyone to go and return plus 2 tests he's holding up a single vile. Cap grabbing 4 bottles gives them a large safety buffer.
because each change essentially exists as a divergent reality, which the Ancient One laid out fairly explicitly.
She said removing an infinity stone creates a divergent reality. That implies to me that time travel without stealing a stone is the predestination kind where your actions result in your own history. So Steve's last trip plays by the rules.
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