I have been reading an article of Charles Krauthammer written about baseball. To be honest, I'm not a fan of this sport then when I bumped into the above phrase, I didn't have any clue of what "stone-gloved" means. Below is the full context.
"Now understand: This is not the charming, cuddly, amusing incompetence of, say, the ’62 Mets, of whom their own manager, Casey Stengel, famously asked, “Can’t anybody here play this game?”—and whose stone-gloved first baseman, Marv Throneberry, was nicknamed Marvelous Marv, the irony intended as a sign of affection."
A quick research about Marvelous Marv has been taken and I get that this guy is some kind of the worst defensive player at the first-base position. So does the fact has any relation with the puzzled phrase above? Or could anyone kindly explain for me in detail the meaning of such phrase?
Thank you in advance!