It would appear that at least in his latter days, Fr. Gruner came to the realization that he had to insert the name of Benedict XVI in the beginning of the Canon (perhaps a year after his 2013 abdication) because he could not pray for Francis if B XVI had not resigned the munis. The Fatima Center (according to Louie Verrecchio) had removed the video containing this from public access, but Verrecchio was able to obtain a copy elsewhere. That is what is linked in the post above.