why do you think teacher came before assistant?
teacher>assistant= training before the battle
even if narutopedia isn't real the years still add up and even madara says he met itachi before he killed the clan it just doesn't say when so I added the years up and it looks right...It might not be right but the only way for us to know is if in the manga Itachi tells sasuke everything
No I am saying he was taught by Tobi before he killed his clan. This only shows that he learnt from Tobi, not that they trained together.
And I dont understand what you mean by teacher>assistant??
And I told you Itachi is 5 years older than Sasuke. Sasuke was 7 or 8 during the Uchiha massacre.