I agree with you here. I'm not a huge fan of redemption arcs either, and the whole inner conflict thing with Moash would definitely go along with "Sanderson's Second Law" which states that a character's weaknesses/limitations/internal struggles are more emotionally powerful and interesting to the reader than their strengths/powers. Kaladin having to face killing him/him dying in the end would also cause some of that inner conflict for Kaladin.