Interesting points. The writers did make a mistake by making Willow's feelings for Oz not matter as much like Tia said by only calling Willow a lesbian after Oz left. I just think that if she had those massive feelings for Oz, then she would be considered bisexual. The only hint of Willow being gay in any way before Tara ever came into the picture was Doppelgangland. So I can see why people would see her change in season 4 being all of a sudden.
I don't see Willow going into a magic addiction when Oz is around and Tara never existed in the series. I'm sorry, I don't see it.
