I don't think that Delenn as an admiral is worth selecting, she gives a +2 to initiative and allows you to fire on a skeleton crewed ship but whats the point in the plus to making an enemy ship stand down? This tactic is just about never used as you have to be very lucky or tactical to ever put an enemy ship in a position where you have the opportunity to make them stand down.
I would much prefer to see statistics for a new minbari admiral such as, despite his short lived appearences, Neroon! I think that Delenn has been included to give an admiral to both the Minbari and the ISA thus killing two birds with one stone, and also saving Mongoose the bother of creating a single admiral for both. If you want a character admiral after the formation of the ISA what is the Minbari Federation supposed to do?
I think that its great that you can design your own admirals but using the rules for doing so you can't make such powerful admirals as the independent ones Mongoose have designed. Does anyone else believe that the major races, if not every race deserves its own specially designed character admiral??? Its easy enough to create one or there are plenty of characters from the series which could be used to develop one.