Theirry Henry has admitted that he never expected one Arsenal star to reach his current level. The Gunners have come leaps and bounds in the last four years under Mikel Arteta, with the former Manchester City coach transforming Arsenal back into their former best having challenged for the last two Premier League titles. With the Arsenal squad one of the youngest in Europe, there’s a real sense that the Gunners could be around for a while in challenging for silverware with Arteta at the wheel, who has managed to bring the best out of a number of players in north London. Yet legend Henry has bee…