Could have also been something Brock requested. If he's going to be buried on the bench and not get any PT, it's better to sign overseas for better money than the D-League and get minutes.
Does anyone know if the D-League rules have changed? Used to be that outside of the two you could assign from your roster, all other contracts were signed with the league. The teams would pay the players, but their rights belonged to the D-League. However, I keep reading about some guys with partially guaranteed contracts getting released, but agreeing to play for that teams D-League affiliate. Maybe just out of loyalty, but those guys are FA's, IINM.