I’ve had a question that’s been bugging me for a while. Maybe I’m missing something totally obvious. What was the purpose of the van in the final battle of Endgame? They made a big deal about having to start it up in able to get the stones back in the past. I believe Thanos ends up destroying it anyway and then we all know that the stones are returned by Cap. So why was it so important for them to try to return the stones then and there?