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Seems like Cass was trying to elevate himself using Heyman's advice that they can't fire you if you're a big enough star.
Thing is, Cass isn't Cena, Bryan, Styles, Orton etc. He is definitely someone who can do/say what he wants and not be fired by the company.
Also, Cass isn't necessarily strong enough promo wise to be able to really elevate himself.