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He created it, but I would be shocked if he had actual say in the show any more. He’s moved into other projects. It’s like when you were working something you cared about a job and then left. Sure you might grab beer with someone you used to work with and they may take your advice, but it’s not really yours anymore. There’s probably a scrap of paper somewhere that proves it, but you’re off doing your new thing, and they have it running themselves.
In fact, I doubt Groening would care to intervene, it’s just not his baby anymore. I don’t think it has been for almost 2 decades.
This was the reason he created Futurama, because he retained all the rights to it unlike the Simpsons. That’s also why FOX killed it.