It is completely irrelevant if Mendy would saved it. And I see a lot of talk about this.
If Koeman decides to rest Messi in Copa Del Rey game (even final) and Braithwaite does not score in some attacking situation, their fans wont go: oh, Leo would dribble here past 3 players and score...
Mendy is my POTY pick for this season and best GK in the league so it is crazy to expect the same from Kepa. You can blame TT tho. but Kepa does not deserve this shit.