the HH fluff is actually pretty clear on the 30k part... The Lion at least is loyal as fuck
He actually came to Imperium Secundus to see if someone imposes himself on the Emperors place and if, fuck that guy over. But since it was sanguinius and that guy didnt really want it he accepted it grudgingly
and there's the quote in the Primarchs book Leman Russ - goes along the lines when charing the enemy at a compliance operation he has a ritual of mumbling "one more world for you, father... one more world" Doesnt sound like a traitor :P
Oh yeah, ynnari, about that... @USSX-Hares is technically the creator and maintainer of that CAT, he wrote and operates a funky bit of python that works the magic to combine all the three Eldar cats together...
But he's been AWOL for a while
So I might have to follow the links he sent me, download the program and figure out how it works for myself
I will also have to finish off the last of the craftworld bugs too...