Red Pill is top tier amongst the genin. If I recall correctly he was still lacking in some speed feats. Id put him under Gaara, Lee, Naruto, Sasuke, Kimimaro, Neji, and Kidomaru. Choji doesnt have much time with the pill. Gaara can fight from a range. Lee is faster and more powerful. Naruto can survive a chidori through the heart. Sasuke can read and dodge his movements. Kidomaru can fight from a range. Kimimaro is a tank. And I think Neji might still be fast enough to speed blitz and stop his chakra.