Are you guys serious? Okay team 7 MIGHT win this, but I say the Kage take this battle with high difficulty. Don't let Madara fodderizing them underestimate the Kages' power. For every great jutsu team 7 has the kage have something to counter it. Let's break it down abit
-Amateratsu-AY can doge it and tag Sasuke.
-Susanoo-Tsunade can smash it with her chakra control.
-Kamui-Kakashi has it but it isn't on Obito's level. While he is performing kamui, another kage would tag him from afar ex: Oonoki or Mei.
-Fire Jutsu, countered by Mei's water.
-Futon Rasen Shuriken-Still a wind based tech Mei's Lava would probably work here as well since one of it's attributes is Fire.
-Gaara and Oonoki possess top level defensive jutsu as well.
-Mei can counter all of Sasuke and Kakshi's Fire jutsu in addition to poisoning them. Her Water jutsu is on Par with madara's fire jutsu(Shouldn't underestimate the Mizukage)
-Healing-Sakura is not on Tsunade's level yet
-katsuyu-Tsunade can summon this too.
the real trouble for the Kage comes mainly from Naruto and Sasuke. They have both fought the Kage before. Tsunade's Byakugou is gonna keep her going for quite some time. She's a tank as is Ay so dropping them will not be easy. In order to really end it Naruto would have to go Sage mode or TBB the hell out of all of them. But again, Ay is fast and might render that usless as it seems it takes time (Like Oonoki's Jinton) to power up.
All and all this fight could go either way. This battle is not as 1 sided as you might think :scorps: