Thank you both for the contribution on the A's players.
I've looked into Jimmy Foxx's career and I agree that he is a great candidate for one of the A's players. By all accounts, he was amazing at every facet of the game. Everyone should look him up. On one ill-fated day, Foxx got beaned in the head during an exhibition game while on a far flung offseason Barnstorming tour. He clearly sustained a concussion, and it altered the trajectory of his career. Foxx still finished with 534 career HRs--including 6 homeruns hit completely out of Comiskey Park over the left field grandstand. Foxx was a hero of Ted Williams. If it wasn't for the trauma he suffered from the beaning, who knows what Ruthian heights Foxx could've reached, or eclipsed.
Doc Powers is another great call. According to SABR baseball historians, he was an incredible defensive catcher, and personal catcher/ horsewhisperer to Hall of Fame Lefty pitcher, Eddie Plank. As mentioned, Doc Powers is about as close as it gets to dying on the field (this side of Ray Chapman). It's unclear what happened, but theories include Powers ran into a wall, ate something bad, or played through a long term issue that became acute. Regardless he was rushed to the hospital and had emergency surgery to remove a mass in his intestines, but never recovered. Like Doc Graham, Doc Powers was indeed a certified Doctor. And while Doc Powers may have played longer than Doc Graham, perhaps he touched fewer lives outside of baseball.
Good stuff!