That does not work because you won't have multiple parties vouching for a new entrant. That's the whole reason a web was chosen instead of a tree in the first place. Trees are super fragile in comparison, bad actors would have a much bigger chance of going undetected in a tree like arrangement.

What is a web if not multiple trees that have interconnected branches? :)

In the end, it's all lists anyways :)

Well - lists of tuples. Otherwise knows as a graph :)