his rivalry would naruto would mean that they would still have progressed really quickly... sasuke learnt rock lee's speed and chidori in a month and naruto learnt to use the kyuubi's chakra and use an a-rank summon in the same time. imagine what they'd do in three years. and knowing itachi he would still have forced sasuke to kill him one way or another, making him get ems. unless tobi kills sasuke when he refuses to go to his side