The Springfield Ponies postcard in B&L's recently-opened auction got me digging through my Springfield and Kansas City team cabinets. There were quite a few T206 players on the 1912 and 1913 KC teams, but curiously, none of them are among the actual Kansas City T206 cards:
1912 - Barbeau, Carr, Downey, Fiene, Maddox, Bob Rhoades, Lee Tannehill
1913 - all of the above except Maddox
My 1913 photo is labeled, but I'm having a tough time id'ing the players in the 1912 one. I was able to locate Nick Altrock (top row), and I think that's Chick Brandom 2nd from the right on the bottom row - MLB Reference has no stats for him from 1910-14, and he played for the Pirates, so certainly possible.
Here is detail from the 1912 cabinet:
