By Ayeotan Shola/@NihzaTheGuru Petr Cech may have enjoyed a fine pre-season with Arsenal, but his Premier League debut did not start in the same invincible fashion, with the goalkeeper culpable for both West Ham goals. Cheikhou Kouyate put the Hammers in front with a header after Cech came charging out of his goal and totally missed the ball. While defenders Per Mertesacker …