Assuming that Chicago would be interested in EJ (At this point I'm not sure if they even want to be winning games, they might prefer just a pick for Jeffrey) here's my take -
At some point we are probably also going to need a backup QB this season, and I think EJ gives us a better chance to win those games than Cardale right now. I'd also be intrigued to see how EJ does under Lynn. Also, for a WR to come in right now, you're probably looking at 3 weeks before he can pick up enough of the offense to contribute in a meaningful way.