No one left to even challenge him. Vitali is 39 has one belt. Vitali should fight another 1.5 yrs ...unify all belts..then retire. In the meantime Wlad...should stay active in the gym..wait until a new champ(s) emerges. Wlad should then come out of retirement and beat all of them unify then retire. It's the perfect plan. With both Klits fighting at the same time there will never be a true unification.