Hello,
Occasional lurker, first time poster. I've just had an epiphany on Kaladin's 4th ideal. I think the consensus for the fourth ideal is that is something along the lines of "I will protect those that I can but I accept that I cannot save everyone." I think Kaladins new role as a surgeon will lead to him swearing the 4th ideal. He will have a patient or patients that he cannot save. He will come to this realisation and ultimately swear the 4th ideal (maybe during the assault on Urithru). Furthermore this will unburden him and he will be able to return to battle and have a decisive role in the defense of Urithru. Sorry If someone had this idea before but I did not see it,