Seriously, I dont know where the belief that boxing is a single all encompassing system has come from. Boxers have built systems around their own attributes and often operate from similar ranges to MMA fighters and vise versa. Floyd, for instance, does most of his leading from outside of punching range and uses a similar leaping right hand as Fedor to initiate clinches from there. On the other hand guys like Aldo, Holloway, Joanna, Rumble, Barboza, Dos Anjos and Gastelum all are perfectly comfortable in the pocket. Boxers learn to punch people from EVERY possible position on the feet, the ones the choose to utilize the most are determined by their own attributes, not the art of boxing itself.