Edwards, Staines, Martin, Yeo, & if you count country NZ JFH make up more than 13%. Throw in Burton from last years squad as well just for fun. I know the squad is 30 which doesn't explain your numbers, but top 17 is more relevant imo. There are quite a few QLD kids in the system as well.
Sure, we obviously have plenty of talent on the doorstep, but the fact we cast the net far and wide to select players no one has ever heard of speaks volumes. The faster other clubs start doing the same instead of raiding other clubs jnr rep squads the stronger the game will become.