Re: Locutus and Ben Sisko
The novelization of "Emissary" makes it clear that Sisko realized what a total jerk he'd been earlier and when he saw Picard again at the end he felt ashamed about it and realized he and Picard were both nothing more than victims of the Borg.
Shame that wasn't in the episode. Could have used it.
"Thank you.. for the drinks."