Ahh poor Lieutenant Wotsisname. Who's not been in the "er, did I just get asked out or not?" situation :P And then he dumps himself in it, too. Stop saying what you think people want to hear and be yourself, man! Heh, it's like looking at a younger self.
Interesting stuff with the genesis of what is basically the Trill from DS9. It always did deserve a good backstory.
And I just love Marcus. Great addition to the show, and always adding a much needed spot of humour (sorry to keep comparing to Trek, but Trek always did comic relief in the form of Ferengi or Mrs Troi. B5 wins on that one hands down)