this is what will happen. revan would turn yoda and mace to the dark side because they are crappy jedi. so it would be revan, mace, yoda, vs obi. and very obiuosly(notice the word very) obi would win. i mean there is a big discussion on wether obi is the best jedi of all time by far. or if he is the best jedi by far by far by far. i still cant deside wether he is better then all other SW characters combined X 1000. or better then all other SW characters combined X 1001. so obiuosly obi would win. ( obiuosly i aint joking..... seriuosly)