What a surprising gesture by Isshou and the Marines towards King Riku and the whole of Dressrosa whom have suffered because of the World Governments lack of control over the Shichibukai. Doflamingo was able to exploit the Shichibukai system and blackmail the World Government to turn a blind eye to the dealings and shady activities he had going on. It was because of that power that the people of Dressrosa have suffered so greatly for the past ten years. Isshou realises this and through his actions of expressing his sincere regret and sorrow, he is attempting to mend the relationship between the rightful king of Dressrosa, King Riku Dold, and the World Government.
What a surprise, so Doflamingo’s defeat has been extended to take place beyond this chapter. I was certain Oda was building up the previous chapter to set-up Doflamingo’s defeat in this chapter, but apparently Oda seeks to highlight the double-edged nature of Gear Fourth before he concludes the battle with Doflamingo. The benefit of focusing on the side-effects of using Gear Fourth is it helps to highlight the charm Luffy has and his ability to attract characters over to his side, which in this case happened to be Gatz and the Gladiator fighters who have been targeting him for the bounty Doflamingo placed on his head.