Yerland

If a sufficiently bonded Knight radiant were to become strongly invested in another shard's investiture would that corrupt the spren they are bonded to in a similar fashion to what was attempted against the sibling in Uritheru? For example, if Kaladin got a Ierasium bead, would Syl be transformed into some preservation/honor spren hybrid? Also while yes Hoid is bonded to a spren and seeming hasn't done this despite his extreme level of investiture. However first of all we don't know what ideal Hoid is, its possible he isn't bonded strong enough to the spren to corrupt it. Secondly Hoid has alot of knowledge and experience working with the cosmere magic systems. If anyone would have the required knowledge to keep his spren separated from his other investitures it would be him. I could easily see someone with less experience or knowledge accidentally transforming their spren.

I think Rosharian sentient spren are splinters of shards given the capacity for growth from cultivation, the capability of forming bonds from Honor. But only honor spren and cultivation spren are specific to those two. The rest are splinters of other shards given capacity for growth from cultivation. Then named locally because the rosharian didn't have reference point of the other shards to name them.

There are only ten discovered so far. Remember in mistborn they only had 10 metals at the start, then Kelsier discovered the 11th metal and Vin found other metals in the lord rulers stashes. There could easily be more spren hiding or in small numbers somewhere in the cognitive realm.

Friend of mine mentioned the idea that there should be 16 different types of spren capable of Nahel bonding. One for each shard, as every magic system in the cosmere seems to be dividable 16 ways. Though this would bring up the problem of where are the other 6 types of spren and why aren’t they bonding humans on Roshar, perhaps their intent is incompatible with the ideals of the Knights radiant (Give me a whimsy Radiant lol). Also, I have trouble figuring out which shard each spren would be associated with as there seems like there could be alot of overlap with intent. For example, Ruin might be associated with ashspren given their fondness for destruction, But Ruin is also often associated with blood, which in the Rosharian magic system is connected to inkspren. Thoughts?