Possible everything can happen but not mean that Dortmund can find coming final against real Madrid easily to win it will be very difficult for them to overcome real Madrid. Because they cannot compare performance of real to Dortmund, everyone knows how their so good and very strong this season so predict that Dortmund can surprise people's by defeated real Madrid I think is very early to predict that, But shall let wait and see what can actually happen on Saturday between the real Madrid and Dortmund.
Dortmund can beat Real Madrid but they must have a very wise and proper approach in tactics for the final since its beginning. Real Madrid with their experience and quality, can score goals any time and if Dortmund show their defensive weakness, make mistakes too early, they will have to pay very high cost.
If Dortmund start the match defensively, defend well, they will have bigger chance with time when Real Madrid players will feel like no dangerous counter attacks from Dortmund, lose their patience and try to lift their squad higher and higher to find a goal. It will be time for Dortmund to use counter attacks to invade Real Madrid midfield and defensive areas, and get a winning goal.
I consider Real Madrid will be the champion, not Dortmund but as analyzed, I see chance for Dortmund.
Even though Real Madrid will still be guaranteed to get the trophy, but in the final of the Europa League and Conference League at least the favorite team is lose. With that result, it at least makes me a little hesitant to bet on Real Madrid, because I already lost in bets for the previous two final matches regarding Bayer Leverkusen and Fiorentina. Although indeed, I also realize that it will be difficult for Dortmund to cause a surprise but still, because in football any result can still happen. So yes, I think maybe this season will be a moment for non-seeded teams to succeed in making a surprise, even though it seems unlikely that Real Madrid to lose, but at least Dortmund still has a chance to win. Who knows!