Hmmmm I think Team Gaara has this one. Kakuzu's mask beasts will be able to add more diversity to the battle. Because his Katon Mask would be able to smash those trees with flame using Katon: Zukkoku. Also the Katon can burn down the fortress made of wood. A combination of Fuuton: Atsugai with Gaara's wave of Sand would create a huge sandstorm that would cripple Deidara's accuracy with his explosives leaving them open.
The trees might be able to penetrate through a wall of sand, but Katon Jutsu has it covered. Once Deidara has run out of explosive clay its all over for his team. Heres some more battle scenarios:
-C2 Dragon would be victim to Raiton: Gian. Lightning versus Earth.
-Iron Skin would protect Kakuzu in case of explosives, Gaara would most likely use sand to buffer the explosion.
-If Deidara uses C4 Karura, then Yamato would die as well. Meaning, only Deidara would win. Idk if thats counted as a victory.
-Everyone would die if Deidara used C0. That could be a desperation move, but it wouldnt be a fun battle.
-Yamato could surpress the chakra of both Gaara and Kakuzu if he can get his Mokuton that far. But its 200 Yards, so Kakuzu could see that and call his Katon Jutsu before it gets close.
-If an explosive hit Kakuzu in the back, that could take out all his hearts at once. Only if he doesnt use Iron Skin first.
Aside from all this, I still think Team Gaara has this. They basically have alot of their opponent's weaknesses on their side with the elemental masks.
