I have to agree with your summary of the article. It seems that a former Democrat congress thought they chopped the power of the executive branch down to manageable size in their estimation. Any Democrat president who tries to push beyond the boundaries set by them is ignored by the press and congress. Any Republican president will find himself in a battle with the Democrats and his own executive bureaucracy, and the press will make it into a public event in an attempt to undercut him.
I thought this quote from Flanigan said it all in regard to Addington's "transgressions."
But Addington "usually had the facts, the law and the precedents on his side," says Flanigan.