I understand your point completely  The counterpoint I made above is that using your argument I can make an equally valid one for a different cast order based on the order in which they appear on the official Greys Anatomy page  Personally I think the most accurate way of listing them is as billed in the opening credits  Yes they do say withand  They could say featuringand or simply and  Ultimately IW and PD are billed last in the credits so they should be listed last here if the general consensus is to use billing order for listing the cast  Thats the great thing about these discussion pagesit allows for differences of opinion to be expressed and consensus reached  Currently there are three opinions on record two of them support listing the cast as billed in opening credits regardless of the withand structure  Hopefully others will chime in with their thoughts or opinions  I apologize if you felt I was undermining your argument