If NO jocks have been aboard two or more winning horses in all three Triple Crown races, it would be obviously an impossiblity for any jock to do what Borel might do if he wins the Belmont: win 4 races (with the first one unofficially considered “the filly Derby”), and then all three Triple Crown races, TWO of them aboard the Derby and Belmont winner, and the other two aboard the Oaks and Preakness winner. THAT undoubtedly would NEVER be done again, for what it’s worth. If Borel accomplishes that , it will be The Year of the Borel, even in China.
True, but there have been 11 TC winners. The way I understand the question, it’s entirely possible that one of those years, one of those riders had ridden the Oaks winner. I think we would have heard about it, but there you go.