1. Kabuto saved Obito from getting slaughtered due to ET. By giving Obito power, he made the war more equal, therefore making both sides take massive damage, which is what he wanted. Manipulated.
2. They used each other.
3. He's not dead, fool. Honestly I guess people skipped the Kabuto vs Itachi and Sasuke battle.
you dont know what manipulation is dont you?...oh yeah he didnt die silly me xD