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The thing about skk being a "brain and brawn" duo is that I feel like a lot of people put them in a box and refuse to acknowledge that just because they are one half of the duo does not mean they are incapable of being the other.
Chuuya is obviously the powerhouse behind skk, but the amount of people who think he's stupid when he's not stupid, he can be emotional but that's not all there is to him. He figured out that Randou was lying almost as fast as Dazai did, it says in Stormbringer that everyone was surprised that a sixteen year old was managing the gem trade so easily but he was. You'd think they'd have someone incapable in such a high leadership position? I will truly never understand why someone people think he's dumb when like, he may not be a genius like Dazai or Ranpo, but he's pretty dang smart on his own, his highest level of education was preschool, mind you.
And Dazai is not the best fighter, but he is pretty capable. He was able to completely pummel Akutagawa (whatever you want to say about that), and Akutagawa had spent a lot of times in the slums fighting to survive. He's not the most capable fighter, but I think he'd handle himself pretty well in a fight if he had to. He kept up with Chuuya after being away from him for four years, and yeah Chuuya was definitely going easy on him, but he isn't helpless.
tl;dr: skk are more than their stereotypes.