One thing that one must consider, is that Irenicus' spell did not work as intended. He did not, in fact, steal the entirety of the protagonist's soul, but instead shared it with him/her (as revealed in his final conversation in the Abyss). It could therefore be argued that Irenicus established a link to the protagonist's soul during the captivity, and that is why Jon didn't worry about being separated from the Bhaalspawn. Thus, it could have been both a combination of Irenicus and Bhaal-taint in the dreams. Or, as we know, it could be that the Bhaal essence possessed some faint knowledge of what was to happen to each of the Bhaalspawn and goaded them on to their fates.
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