Carl's come to offer his congrats and tell the team they're great. And I think Debbie realizes that he's actually a good guy. And they finally get a kiss! With a cheering audience, lol!!
Deb is really about struggling to let people get close and accept them this season. Normally we see her as such a bighearted maternal figure, but with Ben and with Carl, she holds back for a long time before finally welcoming them into the family.