Welcome to the Club Exzessiva (=. Although you need to say the word as posted in the first post...
I'm not hoping or seeing that is a possiblity really. Tsunade already healed up Onoki and Gaara. As said Gaara seems a bit young to die, Mei does seem like she is going to die, neither is A. Onoki may die cause he is one of the old guard and his death is a symbol for the new generation to unite under one banner as he was alluding to in the Chapter
It's to be expected since healing them is quite particular if they are going into battle. Tobi uses headbutt, Naruto uses Headbutt, double knockout. I presume this will be Tobi as Six Pathes of Pain vs. Bee and Naruto. Good stuff coming up, too bad we have to wait two weeks.