There are times this season when I've imagined that I could walk into our midfield, and arguably Toure has ambled his way in too. :-)
I've no evidence to assert so confidently that teams or players exploit circumstances, or do not, to their own advantage, but I'd imagine we have sufficient pull to turn the head of most. That said, I think it can be particularly hard to attract established internationals from certain leagues (Germany, Italy, and Spain), when the player has hitherto shown no appetite to venture forth. I'm not belittling N'zonzhi's ability, but at 28 I sense that his age and style are perhaps not quite what we require in the coming seasons, even if it's what we're sorely missing in the here and now.