If Sting and Rogue killed their dragons without any sort of shenanigans involved, I'll eat my hat. Ditto if those dragons are Acnologia class.
You know what Sabretooth reminds me of? The New Fishman Pirates. A bunch of relatively powerful brutes that are built up and do douchy things, but are not even on the scale of the pre-timeskip main cast who steamrolls them on the way to the real plot.