Fedor Emelianenko, Wanderlei Silva, Chael Sonnen, Rashad Evans, Forrest Griffin, Dan Henderson, Chuck Liddell, Glover Teixeira ... all MMA legends Quinton Jackson fought (some wins, some losses) -- but none of these beasts qualify as the greatest fighter Rampage has faced -- that honor belongs to Jon Jones.
TMZ Sports caught up with the 44-year-old (don't say retired -- more on that later) fighter last month at LAX .