The point is this: Imagine if Bruce Wayne and Batman were two different people. There are not many comic books in which Bruce Wayne appears but not Batman. There are more where Batman appears but not Bruce Wayne, and in most of the ones that feature both, the reader cares more about what Batman is doing than what Bruce Wayne is doing. In our real world that we actually live in, Batman is better known and used more often. Therefore, he doesn’t qualify.
Whereas Jack Ryder is used by writers in stories more frequently in his civilian identity than he is as the Creeper. You’re more likely to see just Jack Ryder, loudmouthed talk show host, than you are to see the Creeper, cackling crazy yellow-skinned superhero. The question is if any other characters are like that.