Board Thread:Theories and Speculation/@comment-1872728-20160626062615/@comment-734582-20160627223230

Interesting that you allow something as broken as Eight Gates but not Shikotsumyaku (which isn't Kaguya's power btw, it's Kimimaro's). A similar thing can be said for Wood Release (since what makes Hashirama broken is his jinchuriki-like reserves, not his wood release).

Practically, if you forebade use of Six Paths power, the Juubi, Kekkei Mora and Mangekyou, you've covered the most "hack" techniques out there.

Else, there's no reason not to forbid any and all Kekkei Genkai.

Still, 1: Hiruzen Sarutobi 2: Might Guy 3: Raikage 4: Onoki 5: Orochimaru