I believe Comey would come under the heading of “inferior officer” which doesn’t require Congressional impeachment and removal.
Yes, I tend to screw that up - “cite”.
Does Congress have the power to impeach and remove the Director of the FBI? If so, the Director of the FBI is subject to impeachment and removal by Congress; and can be removed by the president.
Does the president have the power to fire the Attorney General?
FWIW, the line between "inferior" and "superior" is a little murky. But I take your positions as: