Are you sure you're not thinking of Hugh Hewitt?
Erickson occasionally fills in for Rush. (Let's just say that he's better to listen to than Mark Belling.) Is Rush GOPe too?
But if your contention that "Erick Erickson is the GOPe" is true, then he would definitely know what they're thinking, wouldn't he?
Thus, your contention, if tru, would prove the story true.
Erickson was a gigantic Jeb/Rubio buttboy and he hasn’t subbed for Rush since Trump overpowered Jeb last summer. He has been attacking Trump non stop since July.
Everything Erickson says is designed to hurt Trump and support the GOPe position.