From the list of questions: Is Sazed the only person to hold more than one Shard since Adonalsium shattered?
I got the wording a little different - I asked if Sazed is the only one to hold more than one Shard.
Brandon answered: “Sazed is the only one to currently hold two Shards.” After a few seconds, he added, “I’m not going to say he is the only one to ever hold two.”
That’s all he said about it though.