Today's CDAN blind says this showrunner is not fully disgraced yet, but he would often show child porn to his writers to give them an idea of what he wanted to portray on the show. He also told them that CP turned him on a lot!

Overwhelmingly, posters are guessing Dan Harmon. The episode in question that is believed to be based on a depiction of CP is season 1 episode 2 "Lawnmower Dog" where Morty is propositioned by his teenage granddaughter in lingerie.

http://www.crazydaysandnights.net/2018/07/blind-item-14_25.html?m=1

The comments are worth checking out. People are aware of the Hollywood cesspool!

Also, for you CDAN followers, Himmm has not been commenting for awhile after the big blow out with readers wrongly identifying a potential Himmm and causing trouble for some poor innocent person, however Himmm commented on this blind and wrote "you guys are sure obsessed with pedos". It seems like an odd comment from Himmm since he/they have posted and commented a lot on the problems of pedos in Hollywood. Strange.