The last few yards of top keeping are psychological.
What's to admire about Szczesny? He came in and saw off Fabianski with confidence and resolve, despite the latter's sometimes resurgent form, so he did well there.
This season he's a decisive keeper who's been making bad decisions. He's now facing the second big hurdle of his career, so it's more a question of how he responds now than of making a preemptive judgement. Jury's out.