Yes, you're right on both counts you clever lad...although the concept of a reptilian race influencing human development predates David Icke's weird theories by many years. In some instances, millennia.
I came up with the mythological basis for the
Outlanders series as a way to differentiate it from Deathlands...as well as the idea of featuring the "Babe of the Book" on the covers.
Zecharia Stichin's theories regarding the Annunaki weren't new by any means, but he put them together in a semi-cohesive form, recasting them as not just myths but the history of a squabbling royal family.
Just to let you know--there are no "authors" plural in those examples...just me, the
Outlanders series creator, Mark Ellis.