Sydney University Football Club had NOTHING to do with the formation of these two junior clubs. And nothing to do with them, apart from the last few years. Both Canterbury and Petersham had junior teams for many years before SU decided to come on the scene. SU's involvement stems from a move by other rugby clubs in the 90s to establish a set of criteria to play in the NSW premiership competition, one of which was the development of juniors in a club's catchment area. Everyone knew this would involve practical difficulties for a university club, and, to be honest, most others were prepared to cut SU a bit of slack. The current sponsorship/management/support from SU to Canterbury and Petersham is only done because they have the resources to do so. Canterbury RFC would've liked their juniors to remain attached to Southern Districts but they don't have the resources SU does.
I'd be very surprised if there were more than a handful of Canterbury and Petersham juniors running around in the blue and gold, but, if SU's contributing to rugby development in the inner west, I applaud them.