They do have a good draft spot but he would still be responsible for having to deal with the Eli situation. He would be taking a job which would automatically have a controversy at the QB position with the debate of keeping the aging Eli, drafting a QB, and cutting Eli, or keeping Eli, drafting a QB and then answering QB questions for the next 2 seasons after every press conference.
The Lions have their QB and they're in a division that might be easier to win in the coming years. That's just how I view it. Who knows, he probably just clicked better with the Detroit Lions ownership/management team.