Although, Dex proposing a team with him on was weird, I prefer not to read too much into the actions of baddies who know they're busted. It turns into I know-You know-I know...
While that is normally a good idea, Dexander doesn't seem clever enough to go for something complicated like that. I mean, he's the most likely spy in everyone's book without even being on a team, and got there before proposing a team. So I think he proposed that team with a spymate on it, which I can only assume would be happycats, since madchemist is becoming increasingly unlikely due to arkasas' actions, and I know I'm resistance. Which is why I don't like this team, but we have no choice in the matter. I kind of wish last team had passed, but we'd be in the same situation, and I'd be a perfect scapegoat. Here at least it's pretty likely if it's sabotaged that happycats is the spy from it. May be getting ahead of myself here though.