Even though it isn't a popular opinion...I'm sticking to the idea that Ink and Randy are leading separate zombie factions. In Season 1- Chapter 7- Part 3 after the tracers are placed on the Zombies, the Zombies separate into two groups and head in two separate directions on their way to their respective lairs. Angel hints at the idea that there zombies are cliques. Throughout the story Randy always seems to be either working alone or simply holding a position until Ink arives, either way his actions show a high level of intellegence. Perhaps Randy and Ink originally managed two separate factions of zombies. Though Randy may be the more intellegent Zombie, Ink is obviously the most powerful of the two, and therefore managed to force Randy and his squad into servitude. Just an Idea. But everything seem to hint at the possibility of Randy and Ink working separately before they started working together.