[marcdelpercio]

I'm not sure that I understand your question regarding the Demmitt and O'Hara. These cards feature a variation in the design (i.e. the team change). The fact that this variation only appears with the Polar Bear back is irrelevant to me. If the Demmitt and O'Hara (St. Louis) cards also appeared with...say, a Piedmont back as well, I would checklist these as the same card as the design is the same.

I do not consider the different ads to be a "text variation" as those were intended to be interchangeable amongst all copies of the card. When the Doc White card was designed, the front artwork and back text and stats were intended to be unchanged, regardless of the ad. I consider the version of this card without quotation marks to be a different design.