Call it the year of authentication. After sealing his giddy rise with a first sires' championship last year, Into Mischief has retained his title in 2020 with spectacular ease. Indeed, while several of his predecessors have required a single outstanding earner to elevate them above their rivals, this most remarkable of stallions would have secured the laurels even without the $7.17 million banked by a son on the point of formal anointment as Horse of the Year. As it is, we can instead treat his latest champion, Authentic, as immediate...