Conversation so far:
Tell me about Rex Ryan's sports allegiances.
Rex Ryan developed a notoriety of being a bandwagon jumper.
Did Rex Ryan like any other sports besides football?
Rex Ryan is an avid hockey fan.
Did Rex Ryan make the other teams mad by being a bandwagon jumper?
Did Rex Ryan change his jersey?
Rex Ryan would change his jersey to match the team he was supporting at the time.
Are there any other interesting aspects about Rex Ryan's sports allegiances?
Ryan admitted to being a fan of the Toronto Maple Leafs, as a result of growing up in the city.

Question: Why did he change his allegiance?
Self-contained rewrite: Why did  chang Rex Ryan change his allegiance?