Mouthpiece?
There's a thousand to one chance of that happening.
Not impossible, but still unlikely.
Greg has to temper his show to satisfy the network (The CW/CBS) suits, the license holder (DC), Standards and Practices (Prude Assholes who work for all of the above to make sure no one is offended or all of the above is not liable to lawsuits or vulnerable to massive FCC fines.), the Sponsors (Ford and Coke) and the audience (Us by way of Nielson sampling).
Greg is a man in a stock.
If he has a vision that would conflict with the network, the licence holders, standards and practices, the FCC, the sponsors and us, he has to stop, reconsider and invent less controversial thoughts that will not rock the boat for a show/series that probably depends an audience of mostly 11 year olds.
If you want to a mouthpiece, write a book and self publish online.