Let me help you with "Who's Vesta?" before you get there. (Spoilers, obviously)

[StackzGaming]

Problem

You got near the end and some guy with a generic skin triggered an illogical shock reaction from your crew and you're like, "Who in the blue hell is this guy?" (many NPCs share the same sprite).

Short Answer

From the beginning of the game, there's a guy out sweeping across the bridge. That's Vesta.


The story is that Zola has taken the form of various NPCs throughout the game, some of which you interacted with (the guard in the jail is one), but Vesta is one that you likely never talked to or heard of. He's not critical in any way to the flow of the game and you could do the whole game without ever seeing his name or coming across him. Worse, as I said, his sprite is reused, which makes it even worse.

Why they did that with him, nobody knows. It was a big discussion on the PS4 version, the going theory is that they tried to create a "shock big bad" moment and botched it royally.

[Entelechia]

Yeah uh nah, the game literally showed that in passing for split seconds and so matter of factly that it's super obvious they're not trying to make a huge deal out of it.

[StackzGaming]

Originally posted by Andvari:

Yeah uh nah, the game literally showed that in passing for split seconds and so matter of factly that it's super obvious they're not trying to make a huge deal out of it.

The lengthy threads on various ps4 version threads disagree with you.