Ah Danny! LOL... I actually read most of this on SEroundtable and came to this thread going oh... I betcha that's Danny :P
I don't think that it was
unethical for the fact that malicious intent was not there... I will say this though... if it was anyone else the tables might be turned... but the simple fact of the matter is Danny Sullivan is the Godfather of the
SEO industry and doesn't need to resort to questionable tactics to get rankings....
.02