Fox wasn't a fall guy so much as he was just injured and was released at the end of July. Saying Fox only blew 3 games is odd since he only pitched in 10 games before he was injured and Kim was brought in before Fox returned to the pen. It basically went Fox (injured) to Lyon (meh) to Kim.
Yes, the struggles were that every option in the pen kinda sucked. Kim and Timlin were the best of a mediocre bunch. But that kinda proves the point that you can't put out mediocre options and expect to have success. You need the big horses (aka Foulke) to anchor the pen. If the 2003 team had Foulke, they would have won the WS.