Just because it did not show Danzo protecting the leaf, doesn't mean that he did nothing. As was mentioned earlier, his character was not created yet. He was likely with the other elders doing whatever it is elders do during a crisis.
Would you feel trolled if Orochimaru had placed a "safeguard" within Madara during his edo tensei experiments with him? By safeguard I am referring to a way to stop him in case a situation similar to one that is going on in the manga. An Example of this would be a bomb implanted into the...
IF he utilizes jugo or merges with him, it is likely that he will enter his curse mark form rather than a sage mode. If that happens, I would not be surprised if CM stage 2 is also effective against Obito...
I don't care if ooltafooltanitin and Kakuzu say otherwise, Orochimaru is immortal! And yeah, Tsunade cannot die in battle, but Byakugou decreases the users lifespan after every use. That granny does not have much longer to live...
Kisame new that his Mizukage wanted to "create a world without lies". However, he was unaware that Tobi/Obito/"Madara"/Mizukage was in control of the Akatsuki.
Title explains it all. Yes we all know that Itachi's Susanoo defeated Orochimaru's Yamata no jutsu, but that was solely due to both the Totsuka blade and the yata mirror (weapons foreign to Susanoo).
Also note that Orochimaru expressed great confidence in defeating Itachi and taking Sasuke's...
Kakuzu's earth-style would be pretty useful. Orochimaru would laugh after getting pumped full of lead before regenerating. Basically only some jutsu could counter bullets. Do not underestimate, however, the ability of a shinobi to adapt to a world of guns.
Realistically, Obito will die or defect. Then Kakashi will warp away Madara. This is one of the only ways to stop Madara as we have already seen that conventional sealing methods do not work against him.
He is partially helping Sasuke for the hell of it. He has waited a long time to finally stretch out his arms. He might also want to rub it in Hiruzens face that his arms are back. And, he can always just return the kages back to their coffins at any time.
Even so, Kabuto is on track to becoming the best medic-nin. Tsunade herself admitted that he was more proficient than her at his age. This fact infers that Kabuto will surpass Tsunade...