For example, he says a Nym bears a soul but will not be Reborn as a Nym even though a Trolloc bears a soul that has been corrupted, and will be Reborn as a Trolloc.

The clarification regarding Trollocs seems to imply that souls can be damaged or warped, yet in most other cases he says souls are invulnerable to damage and always return to the soul pool. Further, he links the soul and the physical body very closely in that quote, yet later on, he clarifies that physical damage does not harm a soul.

It seems to me that the time frame of the Q&As might have resulted in him thinking through his answers in between sessions and later clarifying that the soul is immortal (i.e. balefire doesn't destroy a soul - it just ultimately burns it back and returns it to the soul pool, though the characters believe that balefire does destroy it due to their limited knowledge).

This seems like one of those instances where RJ's answers may unintentionally undermine each other due to where he was and the timing of the Q&A session.