It'll be interesting to see what happens next season, if nothing else. Money doesn't equal success after all; it comes down to savvy just add much as resources. If they keep Craig Gardner as their DoF, they're no danger to anyone.
As for us being rattled? Surely they must understand that even in a best case scenario it'll take many, many years before they reach the level we're at now, by which time we could very well have advanced even further.
They always have, and always will be, in our shadow.