Personally, I love the theory that Lindon becomes the new Adriel. There are so many reasons as to why it would work. Mainly, his duality and the fact that Lindon embodies both the concept of creating something, but also the nothingness that has to come before anything is created. Those aren't the only reasons though. My reasons:
- The two judges he met before even hitting Iron were Restoration and Destruction
- He has pure, cleansing madra and destructive blackflame
- Lindon's soulsmithing tool Genesis has this same duality
- He had the Void Icon and the Hammer Icon
- Void is what comes before creation, Hammer is used to create
- Lindon's two Icons represent Nothing and Something
- Or the absence of something and making something
- Lindon represents growth from Nothing (Unsouled) to Something (one of the most powerful Sacred Artists to ever inhabit Cradle)
- He is meek and polite but able to throw his weight around if he wants to (his personality has two sides here)
- Lindon calls himself the End but he is also a "creator" as a soulsmith
- He says the above twice, and once at the end of his Cradle arc but at the beginning of his Abidan arc. This moment is both a beginning and an end simultaneously
- The above also links to the idea of a circle. An embodiment of opposing dualities in a single manifestation. Every point of a circle is both a beginning and an end
- When Lindon ascends, Eithan notes that he has a "fine pair of Icons" alluding to the duality of having Nothing and Creation