Arroyo would be a very nice pickup for us. Sure, he isn't perfect, but he might be willing to sign up to be the 3rd PG here. I'm not so sure T.J. Ford is willing to sign up for that. Let's face it, backing up Rondo in itself isn't all that appealing. He plays a ton of minutes in the playoffs.
However, Arroyo does everything we need in case West goes down: he can start an offense and handle the ball. And if it's the playoffs, he'll only need to do it for 5-8 mpg anyway.