Is the MU story focused on the MU Sisko?
Yes. I didn't particularly like it, because it fell short, to me, of what it was supposed to present and deal with. Maybe it's just me, but that was one of the dullest and most emotionless of the stories (ironic when one considers the emotion that it's supposed to deal with is lust). At the end, I honestly couldn't really tell you much about what happens, except for what one of my friends called "the gay scene". (Note, that's their phrase, not mine).
Same with Revenant
, pretty much.