McCabe ratting out Comey is evidence of panic. Here's what I think happened.
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When he saw his pension threatened, McCabe said he would "bring it all down" (something like that) if he was fired. He wasn't threatening Trump with that, but Comey. Comey was put on notice to keep him from getting fired.
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Comey probably tried but was unable to get it done. McCabe was fired. Hence Comey was exposed as having lost power.
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McCabe will flip, seeing Trump >Comey now. And now Comey is panicking, because his underbosses have lost respect for him.