The notion that he has lost credibility with his team supposes that their standards are higher than they have demonstrated. The notion that he has lost credibility with the press suggests that he is attempting to defend the indefensible—which is another way of saying he works for Donald Trump.
The idea that anyone could reign in Trump more than Kelly has seems like wishful thinking. If a Marine general can’t do this job, good luck finding someone who can.
Donald Trump leaves a trail of professional corpses in his wake. Whether Kelly was changed or the real Kelly was simply revealed by virtue of being placed in this role, Kelly’s reputation has been irreparably diminished by virtue of attempting to serve this president.