yeah, kabuto has acquired orochimarus chakra and its a major boost but that is chicken feed compared to the one naruto has... i mean to say, yeah, he can summon those dead people but is his chakra alone, enough to control all those people? i mean, of course they're controlled by a jutsu, but i dont think he can use all of them in a fight... but with naruto's arsenal now, i do believe kabuto wouldnt stand a single chance... sage and fox's chakra and all... no offense but i really think kabuto wont stand a chance to either sasuke or naruto now...
It's obvious that he is no match to either of them. But he will give them a hard time. Naruto is like a Sledge Hammer... All the power, none of the precision. He has lots of chakra, great potencial, sage mode, etc. But he lacks overall jutsu knowledge, he isn't very smart in battle and he lacks the ambition to do what ever it takes to win. Kabuto is the oposite. He doesn't seem to have great chakra or powers, and the ones he has were adquired by twisted manipulation and aren't "natural" or "perfected" as the ones naruto has. His body didn't want orochimaru's abilities. It rejected them. Now it's overcome by them. He's and impure breed of ninja, twisted and mangled. However, he is very smart, has great knwoledge of jutsu and great experience of battle. He's very controled and has great drive to win. He's like an arrow. Doesn't do that much damage, but keeps on hitting every time.
It's going to be a pain to win over him...