#4 Former UFC light heavyweight champion Jon Jones
Jon 'Bones' Jones is known for being the most dominant UFC light heavyweight champion and current no. 1 pound-for-pound MMA fighter in the UFC rankings.
After defeating Dominick Reyes at UFC 247, 'Bones' vacated the light heavyweight belt on August 17 2020 and made the move to the UFC heavyweight division.
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Jones is regarded as one of the best fighters in the sport of MMA. Having defeated all the greats in his division, he decided to move to the heavyweight division to challenge himself further.
'Bones' has been busy gaining good weight to have an edge in the heavyweight division. Jones weighs around 255lbs now.
#3 Former simultaneous UFC two-division champion Conor McGregor
Conor 'Notorious' McGregor has come a long way from his days fighting in the UFC featherweight division.
'Notorious' made his move to the UFC's welterweight division for a fight against Nate Diaz, right after becoming the featherweight champion. McGregor went on to have several bouts at lightweight after that.
Currently, McGregor walks around as a welterweight.