Collins, Walker and May all come from other nurseries that are then identified and poached. They only take the ones that their scouts nearly guarantee will succeed.
You do know that the Roosters have set up systems in the Illawarra (via owning Berkeley Sports and Social Club which aligns with with Illawarra Sports High). They have a similar relationship with the Panthers (Kingswood RSL), Knights New Zealand and Central Coast juniors.
They have developed a way to identify and grab the future superstars out of all the best junior nurseries. In the Illawarra, they have fan days, junior recruitment days, right under our noses and in our back yard. I'm sure the same happens in Penrith, Newcastle, central coast, NZ. No one ever says NO to them or Fxck off. The Roosters have never flourished more than under Vlandys watch. Other NRL bosses would have kept a tighter leash on what the Roosters did. Vlandys infiltration of the NRL has given Politis the keys to the city....unhinded access. No one ever says NO to that organisation.