Part of the problem is that all that exposition was supposed to be carried by both Draal and Delenn but it turned out at the last minute that John Schuck wasn't available so everything fell to Delenn.There's tons of clunky (from now on that's my favorite word when talking about this two parter) exposition that doesn't quite flow naturally out of Mira's or anyone else's mouths because of all the hurry.
Another thing I learned when doing the Joe Cuts for the B5 script books is that a LOT of switching around happened when editing the two episodes-twenty-nine instances of changes versus an average of six per episode. My personal feeling is that things flowed better with the script as written than as finally edited but I also realize how hard it had to have been to match all of the set-ups from 'Babylon Squared'