The only interview I ever saw with him was the one on WCIA, where he was draped in a Nigerian flag and talked about how he wanted to go somewhere he could feel like he fit in with the community. He wound up in Boston, which has a large and growing population of immigrants from West Africa (and specifically, Nigeria and Ghana).
I'm sure that wasn't the only factor, but it seems like the most obvious one to me.
I had begun to assume a similar primary reason that revolved around him wanting more contact with people with the same or similar cultural background.