Given their current trajectories, Tapit ($214.6 million) will soon be overtaken by Into Mischief ($205.2 million) as the highest-earning stallion in American history. In terms of volume, however, their respective output just now happens to be virtually identical: Into Mischief, with bigger books across four fewer crops, tallies 1,735 named foals and 1,440 starters against 1,718 and 1,447 for his venerable rival. And though Spendthrift's champion recently nosed ahead by stakes winners (170/166), his upgraded mares are still cycling through and Tapit for now remains clear in the elite indices:...