Black bear, Gold Monkey, and Wild Dog were also the top Cerulean hunters in the park who all had mastered their wild release forms already.
Only other Friends who had mastered their wild release are Moose, Lion, Wolf, and the Owls. Serval was just starting to tap into hers at the end of season 1.
Wild release is supposed to be the way to fight Ceruleans that are that big on par. And even then they lost to Big Dog Cerulean.