Charles Hamilton’s “The Autobiography of Frank Richards” (postscript): Why are most of the author’s twenty-eight pen names never mentioned?

Brevity might explain why most of the pen names are not discussed at any length, but brevity alone cannot explain why most of them are never even mentioned.

It is possible that the Frank Richards personality did not know about many of the other pen-name personalities, or, even if he had heard of them, that he was not very familiar with them.

In multiple personality, alternate personalities tend to be segregated into various groups, rooms, realms, layers, levels, etc. The personalities in any one group or at one level may be acquainted with each other, but may have no awareness of personalities in another group or at a different level.

Frank Richards may have had various degrees of amnesia and memory gaps for many of the other alternate personalities.