I think that everyone In the main match is worth the Chunnin title.
Neji - he's a genious that learned kaiten and the other attack by himself ffs, and he is not a bad strategic either.
Gaara - What can I say, he's strong as hell
Sasuke - He's good almost beat Gaara in his normal mode
Temari - She is strong and a good analyzer.
Shikamaru - He's smart as hell and always at least 2 steps before the opponent
Naruto - The main character of this show. has the power of kyubi and can come up with a good plan when he wants to.
Kankuro - He's also good and has probobly the same strength as Temari
Shino - we know what he can do with his creepy bugs, and his strategic head.
I think everyone of them could beat a normal chunnin like mizuki. shouldn't that make them at chunnin lvl?