Hi,
This theory just came to me, is really insignificant, and definitely needs some work, but I just thought I'd bring it up. And this might already exist, so...
ShardMinds are people who posses a shard, AKA a piece of god, right? Does that mean that we can call all Knights radiant as ShardMinds? I mean, after Odium killed Honor, Honor became all spren right? Sly has even referred to herself as "a piece of god". Also note that Dalinar was able to bond with the Highfather, probably the largest piece of Honor left. Doesn't this bond show that the bond can exist between all parts of Adonalsium big or small? Who knows, Maybe Im just spitting nonsense please feel free to correct me if i am uninformed. thanks!