From Kenn Thomas:

My last two e-mails were about other artists depicting Kirby. This is about Kirby depicting other artists, specifically John Byrne and the other Marvel got to imitate Kirby. Written by Steve Gerber, these pages are from Destroyer Duck #4, October 1983. “Cogburn” has a removable spine, “facsimiles everywhere” and no genitals. This was aimed at the rote imitators, not good artists who happen to have a Kirby influence.