Reports in the media that Norfolk constituency MP, Dehenna Davison has joined calls for Boris Johnson’s top aide, Dominic Cummings to quit have been branded “misleading” by her office.
What is the difference between introductory comma usage and commas surrounding non-essential names? In the sense, some introductions define the subject of the sentence rendering it non-essential whilst others don't.
In the example: Norfolk constituency MP, provides the introduction to Dehenna Davison so one comma after the introduction, but Boris Johnson's top aide could only mean one specific person.
Are these just matters of style and consistency in newspapers?