If Jon Jones wants to secure his legacy as the greatest pound-for-pound fighter in the world, Randy Couture has some advice for him ... move up to heavyweight and win another title!!
TMZ Sports talked to Couture -- one of the greatest fighters in UFC history -- about Jones, and his beef with the UFC's P4P rankings.
Of course, 33-year-old Jones has held down the #1 spot for awhile, but was bumped earlier this week for the retired Khabib Nurmagomedov ... and has been beefin' with MMA fans over the decision online.