The old stats paradox. He's playing better football at the moment, and he's younger. Not sure who you'd take but hed easily be my pick of the 3 if we could only keep one.Bolton is 21, has not suffered a serious injury, is doing no better statistically than Rioli at the same age, and whilst he is maybe more efficient than Rioli(and Castagna) in some ways, he does not go where angels fear to tread as the other pair do. And that is a difference that should not be overlooked as it matters.
Rioli has probably regressed from 2017 which was his most impactful year. Possibly parts of 2018.