It's pretty known that left footed players rarely if ever uses their right foot, contrary to right footed players, how many times you have seen someone like Robben, Asamoah, Marcelo...use their right foot, anf if they do it looks really akward, contrary to right footed players who can use both and you wouldnt notice the difference ( Zidane, hernanes...) And it's also a question of balance, if you played football at any stage, you would now that it's quite easy to turn a lefty defender if he's playing on the right...