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Default class criteria applies to any traffic not matched by any explicitly named class. (Note: default class may be explicitly defined as part of a policy, but if not, it, the class default, is still present implicitly.)
Also when you refer to policy maps on interfaces, keep in mind you may have two, one for ingress traffic and one for egress traffic. Neither have direct influence on the other, nor does ingress policy on ingress interface vis-a-vis egress policy egress interface. (Note: ingress policy can influence another interface's egress policy as the ingress policy might change markings that are being examined by the egress policy. But just matching a class on an ingress policy, alone, has no correspondence with matching on a different egress policy even if they use the same class map.)
