We sometimes talk of the moment in a young horse's career when the bulb switches on. When the resulting illumination is as brilliant as was the case with Greatest Honour (Tapit) at Gulfstream last Saturday, however, it feels as though the whole sport can bask in the glow. Those few strides in the GIII Holy Bull S. when he clicked into top gear, before running clear in the stretch, not only announced his own candidature but cast into exciting new perspective the whole road to Churchill on the first Saturday...