This is my first time writing here so please correct me if this has already been discussed.
After reading around a bit here I thought that while Hoid isn't a shardholder it doesen't mean he is not connected to Adolnasium.
What if while Adolnasium was broken into 16 shards there were an 17th piece, not a shard but a purpose or something similair. And it's goal is to somehow keep balance, not neceserily through putting it together just to make sure that none of the shards take total domition/destroy all the other shards.