I'd keep Warnock another year as a backup defender, no more. He's too old now and the pace of Championship is taking it's toll. Aidy White I'd keep for another year, still young and can, and likes to run at defenders which we need. Work on his final passes and distribution and he'll come along nicely, still young. Some say replace Silvestri, this keeper has saved us and kept us in games with his abilities, he is a good keeper, but why isn't Sullivan working with him, and if so, what is Sullivan doing wrong. Cooper is a good defender, still young and still learning. For most of our players this is their first time in Championship, even Duke admitted it's faster than what he's used too, yet when he was getting the service he was scoring goals, so was Antenucci yet both are struggling without the service; and both have to track back to midfield to help out. When your strikers have to keep tracking back to help the midfield out, or get the ball then it tells a story of the problems in midfield. Adryan is a much better playmaker than Cook, but obviously Redders doesn't think so, or doesn't want too.
