IMO he's not a classic stamina influence but with the right mare he's going to get horses like Authentic with a high cruising speed they can carry over a distance.
His initial stud fee was $7,500 so few if any of the mares he was breeding had success running or producing horses that ran at a high level at a distance. If memory serves me right his current 3YOs were bred at $100K fee which means he's getting a book full of those kinds of mares now. Your going to see more and more of his progeny have success going long. Discount at your own peril.