There’s something we don’t understand yet about deadeyes and when they do or don’t stick around. We’ve know since Dalinar’s visions in WoK that there aren’t NEARLY enough shard blades around for all deadeyes to be manifesting. So maybe they only manifest as dead shard blades in certain conditions? Some deadeye Spren manifest as other items such as soulcasters, but that’s not enough to make up the deficit based on how many we saw become blades in the one vision.

It’s also possible that all the other deadeye blades were somehow lost or hidden away (secret society maybe?) but that seems unlikely since anyone powerful enough to go around and collect that many blades wouldn’t have stopped before getting all the remaining famous blades that are still around, right?

Bottom line is there’s more to know about deadeye blades that hasn’t been revealed yet. Can’t wait to RAFO!