A rather random musing all in all. We all know Hoid was 'at' the Shattering of Adonalsium into 16 Shards. I also assume that Sazed is the only 'person' to have held more than one Shard at a time.
What I suggest is this:
* Hoid was either a/the protector of Adonalsium
* or Hoid was the destroyer/betrayer of Adonalsium,
* and Sazed will be the one to bring all the shards back together.
This is total speculation, but yeah Hoid is obviously being set up to be a rather important in the macro-story, and that Sazed is 'twice as powerful' as any of his counterparts now. I asked Brandon if Sazed was, say, as important as Hoid, his answer:
Maybe I'm just reading too much into this stuff