This episode has the potential to be really awesome, what with all the talk of Sisko being Emissary (which is interesting) but it ends with a deus ex machina that doesn’t quite sell for me. And, frankly, if the visiting dude just “goes back to his time” doesn’t that eff with the timeline a bit? Seems more like a Voyager finish to me. And the O’Brien and Bashir bromance doesn’t need further explanation. We get it.