I agree re: Danny's character maturing emotionally on his own, and not really having anything to do with Lindsay's presence. Just like CSI/V had Greg mature eventually, it stands to reason that NY would have their hot headed character calm down somewhat, in time. And as most of us have pointed out, he went through alot in his two years - his brother, nearly losing his job (or at the very least, losing the respect of his co-workers), losing Aiden, nearly losing Flack, seeing his female co-worker brutalized by a loved one... all of those things would take their toll, and perhaps make him stand back and reassess his actions/reactions. (That's how I like to think of it, anyway ) I'm sure we'll still see plenty of the hot-headed drama queen, but we'll see a more mature version, someone who takes more stock in his actions because he realizes how dire consequences can sometimes be.
He does not, however, seem to me to be the sort of guy who would let a woman change his very nature, he's too stubborn. He would have to change things in his nature because he wants to, because he feels like it's the right thing and the right time to do it. That said, I do think that Lindsay ended up being a good friend for him, and would willingly stick by him when things get rough, just like Aiden did. The nature of his friendships with the two women is different in many ways, but in that one respect, it's very similar - the potential for great loyalty.
He does not, however, seem to me to be the sort of guy who would let a woman change his very nature, he's too stubborn. He would have to change things in his nature because he wants to, because he feels like it's the right thing and the right time to do it. That said, I do think that Lindsay ended up being a good friend for him, and would willingly stick by him when things get rough, just like Aiden did. The nature of his friendships with the two women is different in many ways, but in that one respect, it's very similar - the potential for great loyalty.