Assuming Wonderboy doesnt fuck up his body again and has to recover for 6 months, Leon vs Wonderboy should be on the same card as Usman vs Colby 2. They could also function as a potential back-up for the main fight. If Wonderboy does lose or gets badly injured, then it should just be Leon for the belt no questions asked. I say this purely because I think Wonderboy needs to have that final shot at the belt while hes still somewhat in his prime, but I dont think he deserves it over Leon with a win over Burns. So having them fight makes perfect sense.