When they first met, Roxas got hit with *all the guilt* from way back in the day, when Beato first shared that memory. He was already pretty intent on making sure Battler was okay and protecting him from harm. And now, he's actually getting to know the guy, and he likes and trusts him. They just click, on an emotional level, especially, as you said, after that last game.

I'm also pretty sure that Battler and Lightning are the first Emeralds who've ever seen Roxas cry, since he tries to do the 'I must be strong for my team' thing. But yeah, lots of trust.

Are you playing in the Sea Witch and Hook game?