I don't think thats too much to explain, the diagram is still very clear. For the pitchers' names, why not use names of actual hall of fame pitchers? Young, Ruth, Ryan, Seaver, Niekro, Koufax, Eckersley, Maddux. There can't be any copyright issues with names, right?
Well, the case could be made that personality rights are violated, and I don't know if that extends to names. There are a few in-jokes in the pitchers' names I'd have to see go, but I suppose I could use actual historic people.
I'll note that the players on the field, possibly the batter, would also get their own names.
You could also use first names. Many of the great players can be recognized by their first names and certainly no personality rights would be violated. Cy, Phil, Pedro, Nolan, Sandy, etc. Same for the fielders. Probably would want to have Babe be the batter (as a Sox fan, that hurt , I like to remember him as a pitcher ).
Who's on first, What's on second, I Don't Know is on third, why in left, because in center, tomorrow is pitching, today is catching, I don't give a damn is the shortstop!! The others you'll have to make up
I'll freely admit, I'm not that big into baseball. Normally I'd pepper the player names with jokes and subtle references, but it looks like putting the names of historic players on the field would have more impact on people who actually are fans of the game, and it does kind of fit with the whole history lesson theme CC has going on. However, I've got little feel for which name should go where so I'll let the fans argue it out.
The ones mentioned so far by carl (except Ozzie instead of Cal at shortstop =P) are probably the best choices for each position (most historic names possible). I think more people would get those (because of the uniqueness of the names) than the "fake ones" (I'm sorry, but I don't get a single one of them).