DEREK CHISORA reckons Tyson Fury is the biggest threat to Fabio Wardley’s undisputed shot at Oleksandr Usyk. The 30-year-old Ipswich icon pulled off an incredible comeback TKO of Joseph Parker last weekend, making him the No1 challenger for the Ukraine king. But, just as his celebrations started, the Gypsy King was doing hard sparring rounds,…