Fighting is a lack of words and an abundance of actions.
Chael Sonnen is excellent on the mic, but it is his skill as a fighter that makes those words relevant. If he couldn't back up what he said then he wouldn't be so captivating to fans.
That doesn't mean he should slow down on the trash talk or keep him from changing it up. He needs to stop himself from being a one-note wonder in interviews, and to do it he should study some of the best interview moments in pro wrestling's history.
While some men like John Cena and CM Punk have been left off the list, it is because they cut promos well—not interviews. Sonnen also cuts a great promo, but his interviews are going to get stale if he doesn't learn from the greats.
Here are some classic interviews that he could learn from.