What should have happened is Riku and Isa giving their long overdue apologies to him for what they committed in cut scenes.
That's too difficult for Nomura's brain to consider though, they're all just suddenly happy playing and eating ice cream. Yay.
I think we're to assume the apilogies happened off screen or something. I would assume Riku would feel guilty for awhile amd try and make it up to Roxas somehow, as he seems the type to kind of hang on to his guilt. So maybe in their next interactions it'll be brought up?
Overall the kh characters tend to be very forgiving Kairi basically became bffs with her kidnapper, Axel, after he apologized.