From what I understand, his children are going to school out east and he has said that Saskatoon would always be his home in the end. He has also said that Detroit will always be home to his children. Maybe a lighter travel schedule and closer (relatively) to his children matters to him. So in that regard, it makes sense an eastern team.
Also, alot of the vibe you guys give off is a negative one. He's a young great goalie and a franchise that (traditionally) that has been up there with the Red Wings. With owners with deep pockets and little or no media pressure and lower taxes than Toronto would be.