NK has a cut 3rd soul transposition so that means a dragon covenant was supposed to be a thing? That's false logic. Would you transpose a covenant from his soul? The trend is that you get weapons/shields/magic from boss souls. Though, i DO agree that a dragon covenant might have been cut, just for different reasons. There are multiple mentionings of a dragon cult and an area dedicated to them with their worship gesture being the key to said area. The DS games have had a dragon covenant in both DS and DS2 with the rewards being the dragon body set, said body set is obtainable in DS3 from a character quest centered around dragon worship and the dragon area. There could've been a covenant there to get the items, the battles with the Ancient Wyvern and Hawkwood serving as the method through which you get the items necessary to offer to the covenant for the body pieces, but instead Hawkwood and the boss were given the rewards to drop. Or the game could be exactly how they wanted it in this regard, i just find it hard to believe that they weren't planning to implement a dragon covenant in their 3rd installment when dragon lore is still so heavy in this game, even having a place in Lothric lore with the knights having tamed wyverns and the Lightning Stoneplate Ring's item description, even though they had put the covenant in the last two.