I suppose thats true, mostly the first point you made. Sanderson even mentioned Szeth seeming to run out quicker, but I thought that didn't play a large role in the fight because they both seemed to charge off the coming storms. Also, his shield did block quite a few attacks.
Though I think Szeth is always out of his mind, he thanked Dalanar and grinned at him for prolonging his agony. As for the fourth point, just the fact that Kaladin could be an equal match against Szeth is a big deal.
After Szeth gets
he talks about Kaladin, referencing him as 'the man who owned the skies'. Kaladin just started flying (or shifting his gravity) and Szeth had done it for years. So I thought Kaladin was even more than a KR, but your right about the honorblade.
Also, how do I move a thread?