Jones boxing is incredible. He spent his whole camp working on it, didn't even bother to try and take Gus down and finish him even though he could at any moment, and had his corner rub sandpaper all over his face in between rounds so that Gus would feel better about himself and a false sense of drama and competitiveness would be built up during the fight to entertain the fans.
He clearly just wanted to demonstrate that he was better than Gus standing and in boxing, and proved this by handily outstriking him while confidently not trying to get the fight to the ground at all. Gus had no answers for Jones' superior technical boxing skills, such as his spinning elbows, eyepokes, knee cap kicks, and slapping head kick feints that he intentionally aimed high to lull Gus into a false sense of security, only to use his hand to redirect his kicks back on track to Gus' head while sacrificing no power in the process.
Jones could clearly smash a Klitschko bro standing just as clearly as he outstruck Gus after choosing to keep the fight standing to prove his mastery of all facets of fighting.