Well, here's what I always thought, actually.
The "Main" Promise: Sora's promise to see Kairi again.
The "Other" Promise: Axel and Roxas' promise to "meet again in the next life."
The fight between them is pretty much a clash between the two. Sora's racing for the Castle, looking to save Kairi, but Roxas is right there saying, "Hold up. You just cost me my happy ending." He'd been waiting for Axel, just like he promised, but...whoops. Look how that turned out. >_>
Of course, they have their true "other life" meeting afterwards, so happy endings all around.
But then again, with a promise-heavy series like this, something as vague as "the other" one could refer to about a dozen different things. XD
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