No, I completely agree - I do think that Sebastian’s approach to that moment has to do with the WS realizing that whatever it is within him that won’t let him kill Steve is because of something far deeper than Hydra ever told him, namely to HIM. But Sebastian’s point seems to be that Bucky doesn’t know those facts yet; he doesn’t know WHY his mission means anything to him, or why him surviving matters - only that it does. But a heavy factor was also the analytical part of the WS realizing that there indeed seems to be a LOT that Hydra has been hiding from him, and he needs to find out what that is. So, thought process: save Steve Rogers (even though I don’t know why, and I don’t know who “Steve Rogers” even is to me), and then track Hydra the fuck down to figure out WHY exactly this just happened and I’m now feeling the things I am.”
What I was referring to is that we as Stucky shippers tend to project our own headcanons onto that moment and TREAT them as canon; convincing ourselves that that’s what it really meant because it makes sense, but we’re also sometimes forgetting that we’re biased towards the ship. Yes, something in Bucky had a feeling that he somehow KNEW Steve and had to protect him and not let him die, but from what Sebastian’s said, Bucky’s thought process was a lot more objective than we tend to make it seem. Which is FINE, until people start treating headcanons AS canon and shit all over others for having a different opinion lol then sometimes even I’M like, “K guys, you’re basing that off something that isn’t even actually canon, just your own theory… Don’t criticize others if you’re taking that stance”, you know?
It wasn’t so much, “I remember Steve now and I’m having all these flashbacks and memories and I need to save him because I can’t live without him and his messed up face right now makes me have flashbacks of this scrawny punk who used to get beat up in back alleys and I love him so much, etc etc”.. It’s far more likely - based off Seb’s choices for Bucky’s thoughts in that scene - that it was far simpler than that: “I have to protect this; I don’t know why. But I’m gonna save him and then find out why, because I’ve been lied to.”
Then my overall point is that I totally respect that for the CANON, but if I feel like writing that scene with a DIFFERENT thought process in mind, for the sake of the OTP, I can if I want to haha I just also acknowledge the fact that I’m making that creative decision based on my OWN created desires, and NOT based on what’s been given to us in terms of canon information :)