At the Thaylen City Oathgate on the Shadesmar side when that Fuzed stood over the severely injured and defenseless Adolin, poised to strike his deathblow, I screamed and cheered as Maya jumped the Fuzed, literally, to save Adolin's life! I fell in love with their relationship at that moment and knew he'd bring her back. When she started whispering to him on the other side, I cheered again but wasn't the least surprised.
We do have a ton of KR already, I agree, but we need at least one to three more, as I reckon. We don't yet have a Willshaper or a Stoneward unless we count Taln, and I don't think we can count the Heralds in this respect. And we could use a Dustbringer who is actually loyal to Dalinar.
BTW, this probably has been mentioned before, but I can't help but wonder if the similarity between Adolin and Adonalsium is fifty kinds of portentous. Could Adolin become the new Adonalsium, reuniting all 17 shards? Wild and crazy, yes, but I'm just throwing that out there.
On a related crazy note, I'm wondering if Jezrien's death opens a spot for a new Herald of the Windrunners. Obviously, I'm not sure it works that way, but the other Heralds started as mere men.