I agree on the defensive bits but I don't think you can blame Mendy for no one getting on the end of those crosses flashed across the 6 yard box, that is 100% down to the attackers not making the correct runs. It's just the basics; one front post, one back post, one holding.
As a winger/fullback, you expect players to make those runs, there's no excuses, you haven't always got the time to lift your head and look. Our whole game is based on the concept of "knowing instinctively where each player will be positionally", that's the whole reason for the training ground grids and why we can play out from the back with such calmness when we're pressed aggressively. It's the same with the crosses, Mendy will be told to play those crosses across the six yard box, it's other players responsibility to get on the end of them.