Groundbreaking, I know.

Looks like they want all the (cheap) competition they can get for the third point guard spot. No reason not to either really.
EDIT: Jovanovic too.
http://basketball.realgm.com/wiretap/243347/Nikola-Jovanovic-Trey-Freeman-Sign-Camp-Deals-With-Pistons
Nikola Jovanovic and Trey Freeman have signed camp deals with the Detroit Pistons.
Jovanovic played for the Lakers and Magic in Summer League. Jovanovic averaged 12.2 points and 7.0 rebounds in his junior season at USC.
Freeman played for the Rockets in Summer League. Freeman averaged 22.1 points, 4.2 rebounds and 3.0 assists in his senior season at Old Dominion.