Saving penalties is a skill, Ederson really needs to work on.
Ederson has saved 6 penalties in his career, he has failed to save 39, a 13% penalty save percentage.
Alisson has saved 9, he has failed to save 16, a 36% penalty save percentage.
Willy Caballero has 11 penalty saves, he has failed to save 22, a 33% penalty save percentage.
Henderson has 8 penalty saves, he has failed to save 11, that's a 42% penalty save percentage.
There is a much greater likelihood of cup penalty shootouts as we enter the business end of the season, we need to improve penalties, saves and conversions before then.