Re: if tsunade revives/heals the kages and if she survives aswell where will they go
They will either head straight to the battle field, or they will gather up with the remaining shinobi alliance forces. I believe somewhere along the line it was said that the remaining forces were to gather somewhere close to the battle, and then start planning from there.
Since Naruto and Bee are currently alone fighting Madara, they will need a sealing squad, and well that could be with gaara and some more of the kages. So I could imagine them forming 2 squads, one to seal him, and one that could work in the offensive / defenisve for naruto and bee.
Also they will probably dispatch a team to aid Gai and Kakashi, here I could see ino-shika-cho to work pretty good, and along with a sealing squad they might have a chance, it could also be Gais team, but I don't really see Gai fitting well to fight Obito. Gai should help Naruto since it appears that Tajutsu is the most efficient against Madara. Choza could also be useful in helping Naruto due to his size, it would be pretty cool if the old folks stepped up, but shikaku and Inoichi will probably remain with HQ.
So lets say Oonoki, A and Gai goes to help Naruto and Bee (imo that would be best fitting).
Gai for tajutsu.
A for combo with Bee
Oonoki due to his experience, and he appeared to be the most useful against Madara before
could be the sealing squad since they all got some sort of seals, said can make them air born so can sand. Mei can provide defense along with gara. Kankurou can seal as well as use a bit offense. IMO would be the best setup for them.