UFC president Dana White says Anderson Silva is a "freak of nature" and has questioned whether Jon Jones can ever reach the same level as the middleweight champion.
Silva steps up to light-heavyweight this Saturday to take on Stephan Bonnar in the main event at UFC 153.
While Silva has dominated the middleweight division, Jones has been making a name for himself at light-heavyweight, and there has been some talk of a super-fight between the two taking place at some point in the future.
And while some believe Jones would come out on top, White believes he has plenty of work to do if he is to be seen as a greater fighter than 'The Spider'.
Speaking to ESPN, White said: "Jon Jones is getting there. Jon Jones proved a lot to a lot of people against Vitor Belfort, fighting through that armbar, popping out of it like he wasn't even in an armbar, continuing to fight the way he did, he came a long way.
"The thing is, Anderson Silva has been doing it since 2005 in the UFC, Georges St-Pierre's been doing it forever, Jon Jones has only been on a tear for a year-and-a-half.
"He's had some problems but time will tell. We'll see. At the rate he's going, he's on his way to No. 1 and possibly becoming one of the greatest ever too."
When asked if Jones will one day be seen as the better fighter, he added: "He's so young, that's the thing. If Anderson Silva wasn't the freak of nature that he is, still doing what he's doing at 37 years of age... Jon Jones has forever [to usurp him]."