It’s like Slammers NL playing with 13. They’ve got 2 RL teams an E64 and 2 NPL teams they can draw from but they aren’t because of their own reasons. Eagles NL also keeps a small roster too despite having 18 on the RL roster and talent on non RL teams that could slide up.
If a club runs more than one ECNL program, they can't draw players from outside the program a particular team is registered in.