Patrick Chan also included, at a very venerable age, the quad Salchow. He had done it in practice earlier in 2011... but never included them later on because he didn't need them or at least, he didn't think he did. When he returned to competition, he realized he had to and brought it back and performed it at the GPF in 2016 and Nationals in 2017 at the age of 27. He originally had them planned for the Olympic season, and even included it early in his Dust in the Wind SP (Detroit competition in the summer I believe) but then he got into a funk and his desire to skate clean programs made him water down his programs and he removed the salchow.