Re: Jump!
I'd have to watch that episode again (In the Shadow of Zha'ha'dum(sp?) part 2, IIRC? can't believe I can remember that without looking it up), but I always thought it *was* indeed Kosh, whose "soul" had somehow entered or become part of Sheridan after the former's assassination.
I thought the voice was distinctly Kosh and not Lorien. Seeing as I have them all on VHS(!) still, it'll be a bit of an effort to check (yes, I bet I could get them all from less legal venues).