Two of three are going to the Belmont

[Bobby Fischer]

Danzig, Turkish Trist, Turkoman, Dosage Figures, Conduit Mare figures, Bris numbers, your best guess, my best guess.......

Hard Spun has the pedigree to get 12 furlongs. In fact his pedigree is so distance favoring that he should have a distinct advantage over others as we increase the distance.

The other factor that determines distance capabilities is Running Style. You can't make a middle move and win a top race past a mile and a sixteenth. You can win the Belmont Stakes from the front, but Hard Spun/Pino will have to rate the pace.
I never assume a horse/jockey is going to learn a new trick, when facing a new challenge, but it happens once in a blue moon.