I also think it would have been slightly unrealistic, because Kaladin's hatred is extremely strong, and for good reason. It wouldn't exactly fit for Kaladin to let go of that, because I think that it's not just anger; it's also somewhat trauma. I don't think Kaladin would have been capable of that, because Amaram dying wouldn't as horrible and unfair a death as Elhokar's was/would have been. I can't see even Rhythm of War Kaladin protecting Amaram(assuming he hadn't died), unless Amaram had some amazing redemption arc.