I don't get this belief that the Championship is somehow this league full of players much better than the SPL. Seriously, I watched Ipswich and Swindon regularly play in it over a period of 10 years or so, and while there are undoubtedly good teams in from time to time, there are plenty of average teams in it too.
In particular, the defences are generally poor. It's one of the reasons the clubs that get promoted to the EPL struggle. Clarky would have a field day against teams like Swansea, Sheffield Wednesday, Derby, Blackpool, Coventry City, Watford, Norwich etc.