So West Coast is the only confirmed member of this new GAL league? I would assume they already had at least a few commitments before making the announcement.
My assumption is that all of the DPL teams from each club become their GAL team. The new teams in GAL will be GDA teams or others that opt in.
Using a club like Legends as an example, perhaps the GDA teams are playing ECRL with the goal of getting into ECNL ASAP, the GAL team is the 2nd team, the DPL team is the 3rd team, etc. Don't know any of this for fact, just speculating. I think that the GAL having more GDA teams committed in addition to WCFC is a good bet.