I personally believe his taijutsu is on par or slightly above base Gai, just wasn't emphasized or expanded upon. During his childhood while sparring with kid Madara, his form was very remiscent of Lee's forms aside from him looking alot like lee. Also he has constantly fought against the Uchiha who are well versed with taijutsu (think sasuke, itachi, obito and madara and there is shisui a speedster). He was shown skillful use on variety of swords, and on one panel, very reminiscent of Mifune's battle with Hanzo.
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