The more I read the posts on this thread, the more acceptable DJ sounds. Older? Sure, but he's still got wheels. More than just a deep threat? Yup, he has the ability to get open all over the field. A reasonable deal to return to Cali, reunite with McVay and a gunslinger QB? Absolutely. Anything more than a friendly deal and we should pass.
As far as a PR, in certain situations, yes. He hasn't been the normal PR but when Philly needed a big return, they'd stick him back there. He's actually a perfect fit.
Won't be needed to play 50% of the snaps, so he should be a bargain AND remain healthy. And if you need a good return late in a game, give him a shot.