Sorry, don't have much to say - I don't have the movies on DVD, and it's been too long since I saw this one to say anything about it.

I do always wonder if the Drakh here are the same faction as the Drakh on Centauri Prime - I always imagine the Centauri Prime Drakh drawing up their plans, slowly, carefully sowing the seeds to ensure their revenge against the other races is complete, and then-

"HEY YOU GUYS! I found a Shadow Planet-Killer! Death to all humans! WOOO!"

-mass face-palms as some splinter faction goes on a rampage without bothering to check with anyone else...