I think you're being kind there with Leesley and Cowan.
Cowan, I've replied elsewhere about him
When Leesley made his debut we'd lost one game, we weren't on a bad run. He charges about a lot but reminds me of a kid playing who tries to do everything but just ends up getting in the way.
I think with Keane it's more he hasn't got any protection at left back so he's getting shown up. He's been way off his own high standards for all of the five games but he's getting exposed multiple times every game. Take his defensive partner away too and it's no wonder he's all over the place (and that's not to slag Festus, he's done better than most would, but it takes time to build a partnership).