Joe,
Do you even have a high grade Delahanty to trade? They're pretty hard to find, you know.
You make some interesting points, but it doesn't disprove the source of the riddle. Your criticism doesn't touch the side of the double-entendre originally observed by "Pariah" that says "Sweet Son of God", i.e. McCrea/Chery. That's just a reference to his religiosity.
It does paint some question on the theory that Dan N. raises with "creach" being a downfall/"fall from grace". Perhaps it was not the downfall of the Wolverines, exactly, but the joke on the card via Mgr. Indianapolis being that he was too old to play, it still suggests a downfall.
So the double-entendre still fits... unless you no longer believe the card was intended as a joke?
One more thing:
Deacon White career OPS .740
Ed Delahanty career OPS .916
To each his own, my friend.