I watched Cremona's bureau build this past summer and I did compare the two styles. I don't know if it's pertinent but Cosman's drawer is narrower in the back, he just uses the back to template the front.
I don't think Cremona showed the drawer reveal up close when he was done which I was disappointed in because I wanted to see his style which is extremely important.
What might be important here is Cosman uses full sized dust covers and tight fitting sides to create air pressure. I don't think the air pressure aides in making it more difficult to fit the drawer because he fits it first without the drawer bottom and gets an impressive one-finger-on-a-corner-close fit. I think it's the tight tolerances of the front and sides of the drawer that make it difficult to fit.
Which leads me to the question. What is the fine woodworking standard when we start talking about how far away should the drawer sides be away from the case when closed?