I would have left it in, it's not a violation. Taking it out only wastes time, and here time is money, especially on the rough side.
It's highly unlikely that an inspector would catch one piece of wire in the midst of an entire house. And he or she would probably assume correctly that your helper accidently used the wrong roll of wire. If he finds a 14/2 where a 12/2 should be, than he can say that you are sloppy.
