One other thing I was thinking of was that maybe the Zanmaker sent Ichigo to someone related to Ichigo in the Soul Palace. It could happen.
Yeah that seems plausible.Back to the Soul King. I'll theorize that one reason he left SS is because he could not agree with Shinigami wanting to monopolize SS. Obviously the Soul King isn't a mere Shinigami. Perhaps the reason he wants to meet Ichigo is that Ichigo is the closest being to what the Soul King is, Something/someone that contains elements of all the sentient life forms in existence.