Explaining Pujols' free agency to a 5-year-old

Explaining Pujols' free agency to a 5-year-old:

One morning in May, The Post-Dispatch ran a photo illustration on its front page that depicted Albert Pujols in a Chicago Cubs uniform. This confused and unnerved by son, who had just turned 5. Ever since he's been consumed by this notion that Pujols could — gasp! — play for another team. He has waffled from saying that he would find a new Cardinal to cheer to suggesting he would find a new team to root for if Pujols leaves. I tried to explain f...