Neither did the pixies. They showed up to protect pizza. Toot seemed a little nonplussed about Harry being in danger. The Kenku were just as loyal to Eb as the fairies are to Harry. It's all about debt and obligation. As soon as Harry owes them more than they owe him, the loyalty will be gone.
It is more than just the pizza, Toot made that clear, when Harry freed his brothers and sisters from the White Court captivity, he gained their loyalty for all time. Not sure what will happen though if he does marry Lara, there might not be enough pizza to make up for that.
They showed up by the hundreds. Don't call it an army if you like, but many wouldn't call a bunch of pixies an army either.
Nope, there were twelve of them, the Grey Council, yeah maybe as powerful as hundreds, but still only twelve.