Good point.
But, I'm sure that the matches, fights, and confrontations would've made up for the "unrealistic storyline". I'm sure that if Gangrel had played with Edge's mind a bit more, not only would Edge would be pushed as a "tortured soul", but, also he would've been played the role of the "underdog, who had the fans' sympathy". If only the feud had been booked a little better, Gangrel would've been a full-blown heel along with Christian, and Edge would've had the fans behind him, because everyone would feel sorry for him for what Gangrel had been putting him through.