When you're fishing with it it'll do just fine. I think that what Dan was eluding to is the method of using a whole flank feather and tying it in as a wing. You pick the right size and put 3 lose wraps of thread around the quill and then pull / slide it forward to the point you want. Then you pull the thread tight and wrap it down tight.
This fly is winged in the manner I'm trying to describe. The wing is a full feather;
Here is what they look like from the side, it makes a fly that swims / streaks along real weel.
This is a mallard flank tied much fuller but in the same way. It is a bit overexposed but still shows the way you can wing with single feathers. The wings are very tough when you make them like this. Other parts of the fly will come apart before you lose a wing.