[quote=Hillan]
You read his Backstory, and you'd see why. :P
[/quote]

But I did. That doesn't answer the question of 'why would someone with the skillset of a chuunin be put in with a bunch of ninja who're going to be spending the next month or something painting fences and the like'. Seems all-around bad for team cohesion: everyone else is outclassed, he's held back.