Sranc aren't as senseless as you seem to think though. For example, they have language, culture, complex social structures. They also are used as Elju for Nonmen, which indicates a huge capacity for not just memory and recall, but also communication.
Unfortunately, we just don't have enough information one way or the other. The way Skrafa talks, seems to imply to me he "gets it" and might comprehend paradox, but never explicitly says it. That Wutteät like does have a soul tells us little to nothing, since the other Wracu are clearly derivative of him, meaning we have no idea what aspects might be passed on or not.
In Eärwa I think a soul is very tied to Heideggerian Dasein, that is,
Being-there. What does this mean? It is Being for something for which the question of Being has Meaning. Sranc certainly have language and so they likely understand Being to some degree, but for whatever reason, they do not comprehend the
question of Being. That is, there is no Meaning to Being, it just simply
is. Skin-spies seem about the same, they comprehend that they have Being (that is, that they exist) but they do not question the nature of this Being and when asked, (to unravel the paradoxical nature of Being that would always ceding to Becoming) they cannot comprehend it.
So we are just left to guess how much of Wutteät the Wracu are. The answer is really anything you want though, there is no evidence one way or the other. There also is no logic, Eärwan biology is somewhat like the real world, but ultimately not. Wracu could have any number of souls, from zero to plus or minus infinity, despite, or in light, of that making no sense whatsoever.