…he only became his subordinate in dressrosa when doffy used his title to protect him. Ceasar wasn’t his subordinate pre dressrosa and Doflamingo was never kaido’s subordinate
He gets paid, grows his connection, and weapons
	
	
		
		
	
	
Doflamingo was the king of the underworld because of those his connections and weapons that he was selling to everyone. Even selling them to the world government themselves