You sure? Pirlo even at old age top few most covered ground mileage players, and played full matches and rarely injured. Had excellent stamina his whole career. Because of his slow playing style its easy to assume otherwise, but run high kms per game proved how well condioned professional he was.
Arthur is not only injury prone, key part of your fitness status, but for 2 seasons now the most common critique in Barca was he cant last more then 60 minutes in games, gets gassed. Doesnt sound like he is so fit. Is mobile dribbler who keep himself active on pitch, but his stamina levels a question mark.