BB, Apoo, Stussy, Caribou
I would put Stussy 2nd but she should've knocked out Lucci instead of Kaku first. She's smart but she had a miss opportunity (Unless someone is with her and is about to backstab Lucci next chapter). Apoo is a damn cockroach and X-Drake should be below Stussy instead of Caribou.
Speaking of sneaky, Lafitte is also one and is actually a big reason of BB's success pre-timeskip.