Grindstone as a sire.

Grindstone has had six crops which are 3YO&UP ... and Birdstone is his only significant offspring.

He's had about five or six decent others ... but as the quality of the mares going to him declines ... so will the number his good horses.

Sadly ... five years from now ... Grindstone will be remembered only for his Kentucky Derby win ... and Birdstone ... and little else.