I think Naruto used Fusion with his clone, because the old frog wasn't able to...then again there is no head sticking out of his shoulder. Maybe its a complete Fusion.

Even though Naruto showed up, I can't see the Hokage being like, "oh Naruto's here, im going to go have a sit down." I would really like to see Sakura join in the fight, but I guess she's going to be stuck looking after the injured. Even if she could only chill on one of the big frogs, I think she should be there to witness Naruto if and when he melts any more faces.