He would have been a decent defender in the 90's 00's in the Pl when teams never really played a high line.
This generation of football of defences playing high lines he just looks out of place and you see his limitations in the modern game,Dyche is a throwback manager like BFS and they defend the 18 yard line,horrible to watch but it doesn't expose your defence much and limits your attack as the team is set up to deep,so your team scores less and concedes less.
They say the art of defending is dead these days in football as the modern defenders are so athletic and quick,fullbacks bomb forward like wingers and isolate CB's and the CB's these days cover more ground and get isolated having to cover ground fullbacks leave plus playing on the halfway line as a setting position your defenders need to be quick,with the age of the modern football and how the game has evolved the likes of keane are dinosaur relics from a bygone age in football,he'll look good playing for a team with the throwback defend the 18 yard line manager.
Shows how bad walsh was as a DoF that he bought a defender like keane for koeman who played a high line,shocking from walsh.