hmm.....well if you can write it so that he wanted to split from the imperium but is NOT chaotic. any self-respecting eldar would have nothing to do with chaos followers.
if you write it like the Soul Drinkers chapter, a BL series in which the chatper splits from the tyranny of the imperium but still fight chaos, then that would be perfectly acceptable!
Rosenedal, thats good 2. are there kroot with you though? that would make things more interesting
so it seems that these are all the peeps we are gonna get, so as soon as Ides posts his thing we can get started on a storyline.
regarding that: maybe the Kroot world is attacked and Rosenedals guy is contacted by them, and Kosida decides to take the rest of them along?