Leandro Trossard was the hero for Arsenal against Aston Villa on Saturday evening. Leandro Trossard further enhanced his reputation as a super sub as he came on off the bench to set Arsenal on their way to victory at Villa Park. Mikel Arteta’s side were battling their way through the game, but showing little sign of making a breakthrough, before the Spanish coach introduced the Belgian winger to the fray in the 65th minute. Moments later, he put the North London club ahead with his first touch of the ball. Trossard has an excellent record as a substitute. However, given Gabriel Martinelli’s st…