Those ninja u listed, u agreed zabuza would beat Darui and zabuza already showed he could beat part 1 kakashi. I made a thread zabuza vs kitsuchi and many people said it could go either way, however, more of the respected members on here said zabuza wins a little more half the time. Wait, u even said zabuza beats kitsuchi, u changed your mind. So that's my point here, if zabuza is capable of beating nearly every high jounin and jounin below, and even a few s ranks like hidan and chiyo, zabuza can be a low s rank/low Kage ninjaHe's A+ Rank, Like Darui, Kitsuchi, Part1 Kakashi etc..
For reaching S rank he needs an OP raw power technique... And he doewsn't have one, that's the breach between A+ and S