Edo can be cast simultaneously provided there is enough DNA and victim, there can be more than one similar Edos, coz it based on DNA itself as the main essence.I have a question. People keep saying Orochimaru has 4 ex Hokage as a summoning but so does anybody who knows the edo tensei jutsu and has their DNA, AKA sleeping Kabuto. My question is if 2 people summon the same person with Edo Tensei what happens? Does the first summoner keep him, does the second summoner take him, are there now two edos of one person?