I think what he's getting at is that if you see a power gain from better fuel and more timing then your combination was poorly matched to start with. I agree with that.
As for E85, it alone does not make more power. It allows you to use a higher compression ratio/tolerate higher cylinder pressure. That combined with the proper combination of parts to suit will make more power. It's all relative to the combination and the type of fuel used is a part of the combination.