HELP! SWBF1 Problem = Rebels don't attack me (as Vader)

[Troop]

Firstly, I don't know if I should post this here or if there is some "Help me!" mid-forum or something, so I apologize if I wrote this in the wrong forum.
I'm trying to change Vader to be playable in place of the Dark Trooper in SWBF1 but rebels don't attack me. Only edited units that have saber and the marksmen attack me. How can I fix this?
Thanks for any help.