Lauren was bought as an 8.5M midfielder.
Toure was another defensive midfielder, who was never close to being a top class defender.
Clichy, like every other left back Wenger has ever tried can't defend to save himself.
And Sagna was only good going forward.
So in 15 odd years of trying, you're telling me Wenger has hit a couple of maybe defenders?
So being part of the only undefeated team in the history of English football doesn't put you in the top class defender bracket? Behave.
Lauren was bought as a player who could play both midfield and defence and replaced Lee Dixon. He was superb and to say differently is strange.
Toure was seen as a utility player who play DM as well as anywhere in defence.
Clichy and Sagna were both good players for Arsenal so whether they were top class or not doesn't come into it.
You said Wenger hasn't made any good defensive signing apart from Campbell which is incorrect.