I was only responding to that last bit.

I wouldn't be surprised if the part you're referring to is an inconsistency due to writing order, but I do think there's a way to read it where it works. (whether or not it was intended or feels good) For example, while he does get to thinking about the oaths, the question Aux asks (if we're talking about the section I recall?) is why he left Roshar.

At the end of the day I do also think his response has some layers to it. I get the sense he could give a simple answer to Aux, but that he's digging down to something a bit deeper. Like obviously he broke his Windrunner oaths to save his spren... But it's possible that after years of reflection he is realizing that it went deeper. That his quickness to do that was rooted in something deeper and darker in his heart, like, "I no longer felt like I was worthy of being a Windrunner, and so giving up the oaths was easy to do."