This could be somewhat of a beat-up, because Holy Cross have had a few extraordinary teams in recent years, but don't have the cattle this year.
This what typically happens if the NRL club does not funnel all their juniors through the one school. My understanding is Tigers only have a formal junior pathway relationship with Keebra, though Greg's and HC have benefitted from some scholarship-type arrangements.
I don't think HC have a strong enough junior pathway, as in they don't offer enough scholarships and they aren't a sports high school, to always have a super-competitive team.
PB Blacktown have really come on since St Dom's cut ties with Penrith, and around my way, at one stage Kingsgrove HS were the dominant force because all the Dragons juniors went there. It ebbs and flows.