By Harry Davies Tyson Fury fired back at critics who claimed a picture he posted after pulling out of his Oleksandr Usyk undisputed fight was several years old. Fury was scheduled to face Usyk for the undisputed heavyweight world titles on February 17 but pulled out of the fight on just over two weeks’ notice after suffering a cut in sparring. A picture of the nasty gash above his eye was released in an official announcement about the fight before a video then surfaced of the exact moment Fury was cut. The Brit took to Instagram to reveal his lean physique for the ill-fated fight just hours af…