i wrote the times becuase.
- when the two chunins find sakura, they say it's 4 am, then they go to Tsunde which sends for Shikamaru, and she gives him half an hour to gather as many genins as he can... you can ~ it up to one hour - 5 AM.
- the sound four say that half a day passed and that it's nearing dusk, dusk is anywhere between 4-8 PM(depending where are you from).
- Lee talked with tsunde after the genins left and she asked him whether he was sure he would like to take the operation even if it can kill him.

Lee's appearence is complete crap becuase:
~they had a mad buildup towards the surgery, ever since chapter 90 something, so having him back to action right now is totally anti-climatix ("hey guys! i was out of action for 14 volumes, but durning this off time one on one boring fights you had, i was able to get my spine fixed, and was able to recover my body good enough to run to you all!").
~the whole idea of this arc was to have the five genins battle the sound alone, and to have some focus on them all, not to bring in uber guys to deal with them, Kimi was bad enough...
~Kimi has to be a badass at some point, his build up made him out to be as good as kakashi at least ('perfect heir to a perfect bloodline', 'hokage assaination easy' etc...), at most, he's above Sasuke's level (remember what the sound four said?), so he can't lose now, and if he won't lose, then Lee has to get it. and no one wants to see lee hit the dirt again..

about the henge deal, let's go through the possiblites.
= Kakashi or gai: immpossible, both are away on missions.
= Gaara: he isn't the guy to use henge, and he doesn't know taijutsu well enough...
= Kabuto: the only 'reasonable' option (under my insane conspiracy theory), he wants to check himself against Kimi, and he knows the Sasuke can take care of Naruto easily...
one of the four jounins= shouldn't have the power to transform, and won't want to go alone after the sound four incident...

anyway, it's nice to see that lee's back in action, but he can't do anything to help the plot right now...