Mistakes as in routinely conceding goals from a failure to do the defensive basics. Defensively, there are just too many holes. Geggan is struggling because we are relying on him to be the entire midfield. MCCabe is a complete passenger and Paton, Cardle, Higginbotham and Mcmullen don't really have a defensive side to their game. On top of that, we have Williamson who is exciting going forward but largely lost at the back. You can see he is working hard on his defensive positioning but that tends to result in him forgetting to ever challenge for the ball. Then Riley, he has come with a good reputation but has shown absolutely nothing. Could be that the service is wrong, could be that he has no confidence, could be both. Regardless, he has yet to deliver.