If you want a logical reason why Zabuza would lose? lightning>waterYou're mentally ill. The division beat the G and S Brothers, not Darui alone. Zabuza can hide from Storm Release because he has his mist. Idc if he learned black lightning
Zabuza got beat by a bunch of dogs and since Darui > Kakashi pt 1 and maybe even comparable to pt 2.... I don't see how you believe Zabuza can win.
I think you also missed the chapter where Darui disarmed the treasured tools from the gold and silver brothers by himself and sealed one of them with it. He got some assistance from the shinobi to help with the LAST brother but it was ultimately him that figured out how to beat them in the end.