Ospina has just completed his first season with Arsenal . It is his adaptation period . We all saw what a good keeper he is at the world cup and in France . I can't see any reason why you can compare him to Szczesny . All keepers , even the very top ones make mistakes . Lehman was a very good keeper for us but he made a silly mistake which cost us the Champions league final .
I would make my final decision on Ospina after his second or third season . But from what I have seen so far , he is a very good stopper for me . But Szczesny is a good keeper for a middle table team just like Fabriansky . If I were Wenger I could have started to give more games to Emiliano Martinez . He is younger but better than Szczesny .