"The Developmental Player League (DPL)was initially created through collaboration between the Southwest Division
Girls DA clubs."
Let me interpret this. Surf created the DPL with some help from Legends and Beach so they can keep as many customers at their clubs and not go to ECNL.
Accept Surf was still ECNL when DPL was formed and do not participate in DPL. Was more like Albion, Galaxy SD, Beach and Legends.