Logic in the sense of parsing definitions and categories. It's largely a word game until you connect back to emotions / pain / pleasure.
To restate this, I think this is one of the big aspects of the canon of truth. The senses and pain and pleasure (and presumably anticipations) can present something to us on a perceptual level which is repeatable and therefore verifiable from that standpoint. But is there any OTHER standpoint other than this perceptual level at which something can be considered absolutely the same for everyone at all times and places? I doubt that is possible under Epicurean philosophy, and in fact it's probably pretty clear that it is not.
Are all words (even "pain" and pleasure") purely a matter of definition in our conscious minds, that become locked in only when we attach them to a certain set of perceptions? I tend to think so, especially when we consider that different languages use entirely different words for what we consider to be the same things.
But the whole process of language is not really chaotic or random either. We're all wired in similar ways, and take pleasure and pain in similar things, and see, hear, touch, smell, and taste in similar ways. So it would be natural that we might also process perceptions into opinions (and assign those opions labels) in similar ways.
So there can be expected behaviors within certain natural lanes of travel without there being any intent, or providence, or absolute standard giving rise to "absolutes" in these areas.
Or so it would appear to me today.