I think Setsuna sees OO as the reincarnation of his god O. A gundam is basically just a chassis for a Solar Furnace and as we now know each Solar Furnace is apparently somewhat unique. Because OO has the solar furnaces of the two things that have made Setsuna feel like there was a reason to continue live I can see how he'd be all obsessive about it, still, the whole activation process smelled a little to much like Shounen Heart > Technology for my tastes but hopefully the mechanic was right and there was just a time lag before stabilization.
As to Kataron, I don't see why they need to 'steal' info from CB in order to produce a franken Gundam. It would be more beneficial to just say hey CB can you help us whip up some Franken Gundams so we can not all die? I figure the more Gundams going up against A-LAWS the better, since they have both a numerical advantage and smaller performance gap than what existed between the suits of the first season.
And I concur, Wang Liu Mei needs to get shot in the joints and left to die in space for being such a duplicitious bitch. God only knows what she's got crazy loli Nena up to.