Alas, Jessica had been forced out the year before. KCON constraints limit participants to a maximum of 5 songs, so although Girls' Generation has a very deep catalog, they devoted a good chunk of their time to new or about-to-be-released songs. This might have been the highpoint for AOA, though we did not know it at the time. Choa left in 2017 and Mina departed in 2019.