He walked away during season 4 but people have alluded to him being a lot more involved in that season than he was said to be. He probably tried to distance himself when he saw how bad it was.
The quality took a dip when Carl Jones left
It was revealed through Sony hacks that McGruder. Was in fact involved in season 4’s creation, but most of what he had planned. And written was handed off to new writers. The real reason McGruder didn't return for season 4 is because of his inability to finish scripts at a speedy pace. Sony demanded McGruder to not be associated with the season at all. Despite him penning at least early drafts of some episodes.
Leaked emails provide more light on the fight over the final season of The Boondocks.
www.buzzfeednews.com
ladjem and McGruders demands, saying, This season was produced without the involvement of Aaron McGruder, when a mutually agreeable production schedule could not be determined.
• But other emails suggest that might not be the case. Sheraton Kalouria, the chief marketing officer at Sony Pictures Marketing, after being forwarded the message from Aladjem, wrote that it would be untrue to say that McGruder had no involvement in the show, as he was partially involved.
• In response, Zack Van Amburg, the head of U.S. programming and production at Sony, wrote that Aladjem doesnt want our version of the story out there and that theyre wasting everyones time and holding us hostage over Aarons incompetence.
• Steve Mosko, the head of Sony Pictures Television, wrote fukk em. Hes going to tweet shyt anyway. The fight w create good press. Send it all my way. I wish he wrote this fast on show.
Seems like his ideas for S4 was butchered.