Right after Kyros decapitated Doflamingo, he knocked out Buffalo. A while after that, Sugar gets knocked out for the second time, so it would be safe to assume that Buffalo got healed along with Sugar. This is further supported by the fact that the Executives were brought back to Jora before the Tontattas could get to Mansherry, let me remind you that the Tontattas were already on Level 4 before the Executives started to lose and the Tontattas are noted for being fast. Then there is Lao G, who fell down a trench, so that would bring up the question of how the soldiers retrieved Lao G. The answer is simple, Buffalo used his DF ability to pick up the Executives and used his flying speed to bring them to Jora. In this chapter, Diamante was defeated, so the chances of Buffalo showing up to fight are very slim now, not to mention he isn't really the fighting type. So what is Buffalo going to do? I believe that he is watching over the battles and once Doflamingo is defeated, he will grab him and bring him to safety.