Hi, i'm new here but I have a crazy theory so I made an account so that I could share it.
I have talked over this theory with some friends that are big fans of The Cosmere and we believe that it is possible. I have seen the theory that Hoid will become the new Adonalsium a couple times, but I believe that he already is/was. The theory in its simplest form is that Hoid is/was Adonalsium.
First off, we know that Hoid was present at the shattering of Adonalsium, but nothing I have seen states in what form or fashion. We also know that all the shards have vessels, those that hold them. It stands to reason that Adonalsium also had a vessel that held all his power. It would also explain why Hoid is world-hopping around collecting magic systems, he's trying to put himself back together. I know that supposedly Adonalsium was killed when he shattered, but what if Adonalsium is the name of the power and not the name of the vessel. The death of Adonalsium could be referring to the death of the power when it shattered, but not the death of the vessel that held it. In conclusion, Hoid is what was leftover at the shattering of Adonalsium; he is now searching out the shards and learning all he can about them in the hopes of stitching himself back together.
What do you think of my theory? I don't know the most about The Cosmere so there could be things that i'm not aware of that disprove my theory. If any of you have any evidence for or against this i would love to see it.
Thanks for reading my theory, ~TheVillageIdiot