Questions about things that have been bugging me

[GaryPassamonte]

I keep wondering why the P & S trade cards were not advertised for sale in catalogs before 1871. Did P & S start with the 1869 Red Stockings CdVs as a giveaway? Did these CdVs gradually evolve into the trade cards? Some Red Stocking CdVs have P & S advertising and some don't. Were the blank backed or team lineup on reverse Red's CdVs giveaways, while the Red's CdVs with P & S advertising the precursors to the trade cards?
Another interesting unrelated observation is that only the Red Stockings and the Athletics from the P & S series come in CdV form. Given the popularity of the other teams pictured on P & S trade cards, it's perplexing that no CdVs exist with those images.

Corey- That is an interesting point regarding the Atlantics. Since they had recently defeated the Red Stocking in 1870, it seems an image of that famous team would be issued by P & S to capitalize on the local team's great victory. Does an image of the Atlantics exist that is later than the 1868 version? It's possible there was no later image of the Atlantics.