it had to be the sage of six paths or the 1st or the 4th or madara;s old body or his brother
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he said that he had an enormous amount of chakra so he could survive for very long
He only has too use souls and not and bodys
Itachi Uchiha did come back to life after Kabuto and Madara Uchiha allied. He is resummoned by Kabuto along with many other powerful ninja
Before Orochimaru dies, Kabuto transfers his DNA to himself. So over time, Kabuto is becoming more and more like his master. His techniques are the same and his power is TREMENDOUS!
Before Kabuto merged with Orochimarus cells, he was not stronger then Kakashi Hatake. In the current manga and anime, Its up for debate because even though Kabuto is now merged with Orochimarus cells in an all out fight he still does not compare to Itachi Uchiha (alone), or Sauske Uchiha (alone). Itachi Uchiha (alone) or Sauske Uchiha (alone) can kill Kabuto easily but they need to capture him which is more difficult. While Kakashi Hatake doesn't compare to full strength Itachi Uchiha. As of now he can still able to compete or "hold his own" with Sauske Uchiha. With that said, its hard to say who would win because they are both versatile, Smart and have much experience in combat (Kakashi has more Experience) On paper, Kabuto is stronger In a fight, Kakashi because of how skilled he is has a high probability of winning.