Sasuke is already more powerful than SO6P and you want him to get sage mode? I don't think he'd benefit from it.
let me explain little stupid kid.
so6p beat the juubi without any jutsus. he only got his rinnegan.jutsus were invented later.
juubi is called a god because he was so powerful.... and so6p beat him.
hachibi is just a little part of the juubi, about 5/20 from the juubi.
sasuke was almost killed by hachibi. his team saved his @ss about 2 times or more. and sasuke could use all of his stupid jutsus.
now please tell me how sasuke can be more powerful then the rikudou sennin.
oh i forget, you are a sasuke fanboy so you cant understand this