Saying things like 'everyone knows' just means if us fans can see it, then even the worst full time member of an NRL recruitment staff can see it. Being aware of this stuff is their job. The "next Fittler/Johns/Lockyer/etc" might only be 12 years old and I assure you every club in the NRL is already tracking him. Every SG Ball star, every 20 year old currently holding his own in reserve grade, every 'maybe' with half a dozen NRL games under his belt, has already been on everyone's radar since he was playing Harold Matts, if not earlier.
Knowing the best players isn't how the better recruitment/retention staff members are differentiated from the rest. What separates them is knowing how much they are worth, and how to avoid overpaying them.