Rebel man you have to remember that the Swans have had a 16 year head start on the Storm. (ie since moving to Sydney) This helps inspire the next generation and set up junior pathways.
Although, I do agree that has been one disappointing part re: the Storm the small number of Victorian juniors to play for Storm. I think that totals 4 at the moment (Fonua, Kennar, Tonumaipea and Ieremia). It should increase to 5 in the next year or so with signing of Sua Fa'alogo.
This is one area where Rebels have done better than the Storm. At least 8 players have come through junior ranks and Rebels pathways to Super Rugby (Leota, Fa'amausili, Hosea, Uelese, Tuipulotu, Sa'aga, Aedo Kailea and Canham). Plus there are 3 former Victorian juniors who returned after playing Super Rugby elsewhere (Johannson, Faulkner and Siliva). With Tonumaipea there is another Victorian, although he came up through VRL/ NRL Victoria.
Apologies if I missed anyone.
The reasons for the Rebels performing better in this regard could be a combination of the VRU and private school boy competition being more established and having greater history than the VRL / NRL Victoria, the Rebels may have been more proactive in local junior development and it may be easier as a Victorian junior to break in to a team that is of a lower standard (ie Storm is consistently in the top 4).