That's pretty much what's going yeah lol
I think Akamatsu is try to justify why Eva likes Nagi so much (because the reasoning in Negima wasn't enough for him?) while also trying to make Touta less of a "I want to surpass my grandfather" character by adding all these stuff to him. Personally, I think Touta had been really jumping from goal to goal thus far, to the point where he's really flimsy in what he wants.
First it was becoming a famous singer, then it was climbing up the ranks in UQ, then it was taking hold of the world or becoming the best or something like that, then it was defeating Fate because he murded his parents, but then it was dealing with being artificially made and now it's trying to get into his moms pants.
He's been more reactive than active to be honest, and while he's a lot more amusing than Negi had been, it's hard to like him when it seems he jumps around not knowing what he wants to do with his life.
Koroumaru is the Motoko/Setsuna of the series, so things are either going horribly wrong and ends up getting screwed over, or he finally realises that his gender regardless of being a boy or a girl won't get in the way of being friends/lovers with Touta. It's hard to figure out what Ken wants to do with him.