The problem with our side today against Barcelona was certainly not a lack of height and power. Giroud, Mertesacker, Koscielny, Welbeck, Sanchez, Ramsey and Coquelin are most definitely not underpowered against Messi, Alves, Neymar, Rakitic, Busquests. They are of course, overmatched technically, so Wenger is right. Of course, he is the one he buys the players and picks the team so he is the one ultimately responsible.