Well i was right he improved their defence,he's a quality defender,with Man City from January onwards they had the best defence in the league.
The top CB's in the modern game are all adept in the high line,pace reading anticipation and good on the ball,it's how the game has evolved.
Ramos Boateng Thiago Kompany Pique have been the best CB's the last 10 years and all have/had the qualities above.
Walsh was a idiot singing Keane,Koeman teams all played a high line and compressed teams in their half,it's what his saints side did,for walsh to buy a CB who's was sold by Van Gaal at United who saw his limitations for not playing a high line,his lack of pace being glaring was a laughable signing from walsh.
Keane is a mid table to championship level defender because of his limitations,his concentration and reading of the game to go with his snail's pace being them,the fee was shocking with 1 year left on his contract.
Under Koeman he was awful,under BFS defending the 18 yard line like Dyche's Burnley we saw an improvement,i just don't see him playing under Silva,we will be lucky to recoup half that fee.