Why is it in some cases we get knowledge of who might have auditioned for major roles (Jeffrey Combs for Riker, Susan Gibney for Janeway, Tim Russ for LaForge as examples), but other names seem to be deliberately withheld?
Is there a confidentiality clause due to union regulations? Or does most of this knowledge just come from the rejected actors volunteering the information themselves?
I guess someone with SAG or AFTRA credentials could give a definitive answer.