#3 Jon Jones

Jon Jones is finally set to return to the UFC, after cutting a deal with the USADA. The controversial fighter, who has only one loss on his entire record, is one of the top fighters in UFC, and has had the Title stripped from him numerous times due to doping incidents, and also a hit and run incident.
Although Jones has always wrestled in the Light Heavyweight Division, a move up to the Heavyweights would likely not harm him.
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Jones and Daniel Cormier share incredible history, with Jones being the only one to hand Cormier a loss, and although he defeated him a second time, the fight was called a no contest due to doping.
Jones and Cormier have a lot of bad blood, and facing each other would be an amazing way to put it behind them.