English and most other European languages, the most natural place for the
subject is before the verb. Thus, when we see *Soj vutlu'*, our
instincts tell us that *Soj* is the subject, rather than an object in a
sentence that doens't have an overt subject.
I can't speak for others who have asked this question,
but placement of the object had nothing to do with my question. I based my question solely from the perspective that the pronominal prefixes which normally indicate first- or second-person subject are used with {-lu'}. My hope was that following that model,
we could also allow {-wI'} to see the assumed object as the subject. There is a form of "promotion" of object to subject, though admittedly incomplete, especially since the explicit object placement does not change. I admit that I couldn't recall the results
of previous discussions and so threw it in as an additional possability to be discussed for my purposes. I was not proposing it as my best suggestion and knew there was a good chance others would shoot it down. I accept their objections.
Jeremy