Former Arsenal attacker, Theo Walcott has highlighted defender, Oleksandr Zinchenko as a weakness in the Gunners’ starting 11. Arsenal overtook Liverpool at the top of the Premier League table on Saturday with a 3-0 win over Brighton. Mikel Arteta’s side have been exceptional defensively this season, having kept a total of 14 clean sheets in the Premier League already. However, Walcott claimed that Zinchenko leaves Arsenal exposed at the back, insisting that the former Manchester City star is isolated. The former England international insisted that the Ukrainian did not have the most convincin…