I think you need to read up on your players a little more before thinking about things like collusion.
First off, it's Jeff FraNcis.
Secondly, he doesn't suck. Before his last two starts he had posted 6 consecutive starts with 7 or more innings and 2 or fewer runs. He certainly makes this deal a reasonable, not so sexy, middle of the season, depth exchange. There's no reason to suspect collusion simply because of the players involved. The value is even IMHO.