We'll have to agree to disagree. I don't think you can coach a 27yr old defender to suddenly start defending in a completely different way than what he's been doing for the best part of 10 years. And age is an issue. At 12 a player can be influenced a lot more than at 27.
Sure I guess there are exceptions to the rule. But it tends to be the really top players that can adapt and make big improvements - that's what makes them top players.
I don't have a problem with the coaching of Verm. I have a problem with Wenger thinking he's good enough.
If you think players can be so heavily influenced by coaching I guess you think that there's a coach out there that can turn Gervinho into Drogba????