Real's advantage is not so great that any result in this game will be anything special. And by the way, if you compare it with comebacks in the playoffs when after the first game the underdog team reverses the result, then the comparison will definitely be in favor of two-game confrontations.
And about the unexpected: Atalanta's victory, United's victory... perhaps that's enough
I don’t understand the advantage but if we look at it categorically using every available stats I don’t think Dortmund holds any advantage In this game, they will definitely come out in high spirit to play but mate compare the caliber of both players. Real Madrid is definitely a force to reckon with in the champions league and Dortmund definitely doesn’t stands a chance.
To me Atlanta’s victory wasn’t as surprising as Manchester United and Also wouldn’t if Dortmund pulls out one. Atlanta were definitely up there with Bayer Leverkusen too. They eliminated power horses like Liverpool and sporting, Leverkusen didn’t have such opponents en route to the Final
Real Madrid should win this particular game, this particular season with these squads 999 out of 1000 times, if it's in the Champions League. If Dortmund were to snag a win here, I'd be surprised!
Even the bookmakers are tipping Madrid for the win, on Duelbits Madrid has just 1.62 odd compare to Dortmund 5 odd, even a draw isn’t seen as a realistic chance in this game. Anybody going for a Dortmund is just doing it for gambling sake and not related to the football both teams play.