My theory behind the Frimpong for Rosicky substitution is that wenger wanted to see how rosicky performed in a more holding role, as he's the most likely candidate to play DM on sunday. Frimpong was having a good game, and doesn't appear injured, so thats the only logic behind it. I thought it worked rather well.
You think he was experimenting while losing what could well have been one of the most important games of his tenure? Interesting...
I didn't doubt for a minute that we would get back into it. Too much attacking talent to not score, and against a physically inferior italian side.
