there can be more than one medical specialist......
gai called lee a "taijutsu specialist"....does that mean lee's better than taijutsu than everyone else, including gai?
it just means that they are very experienced with whatever their main skill is.

Yes, feannag has a point........#1 would be a very valid scenario with what happened....although the previews might suggest otherwise
with the two sacrifice thing.....its not like tsunade had to bring 2 sacrifices at the same time that she goes to heal oro's arms......oro needs to have his arms healed first anyway, in order for him to be able to perform the resurrection jutsu