When Doflamingo visits Riku Doldo III in his room at night to tell him to either leave Dressrosa or give him 10 billion belly, at that time Riku recognises Doflamingo as the one who had blackmailed/threatened the Marines/World Government into making him a warlord 10 years ago. But if we go back to the Marine's meeting about the straw hats after the Alabasta arc (after zoro got a wanted poster) where Mihawk joins the meeting and says that he is interested in the meeting is when Doflamingo made his debut in the anime (which was before the time skip), and in the anime Doflamingo was said to have ruled for 10 years which means he took over Dressrosa before becoming a warlord. But somehow Riku recognised him as a warlord? Someone please correct me if I am wrong or please give your opinions on this. Thankyou for taking your time and reading this.