Yea, I guess it one of those thing where I might just be reading too much into it. If Moe/Maith know about Celmommian Prophecy, and I'm sure they do, it makes sense to get a Mandate sorcerer near Kellhus based on Anasurimbor alone.
Part of the Thought's success lies in setting up the dominoes in the right way, so that when they do fall, they fall in a beneficial way, every time. So it all seems lucky, but it's all because it was set up to have highly probable beneficiary outcomes at every turn. Up to, and including, making itself come true.