So far we have people who use windower themselves and even admit that it helps them. I'm not arguing the amount of help windower gives, only the fact that it gives an advantage, no matter how small, over non-windowers. That's a fact you can't argue. If windower gave no advantage, then there would be no point in using it, and I'm sure no one would download a useless program and risk getting banned.
So just admit it. Windower gives an advantage, with the possibility (No matter how small) that it could effect the outcome of any in-game activity.