Was Porto an upset in 2004? no i dont think so. The Mourinho tenure was brilliant, as it was his football at the time. ( not the Bus that is like today in United if you ask me)
They won everything they could win in those years with Mou, they also played the best football i ever seen Porto play, under Mourinho. With the likes of Deco, Maniche, Costinha, Ricardo carvalho, Paulo Ferreira, Valente, Baia, Derlei, Carlos Alberto ( when he was young and good), The awesome Benny Mcharty and such. best Porto team i have seen. And i was fortunate to have seen a few.
From what i remember that match against Once Caldas, Porto was already looted of players, and the manager was Luiz Fernandez. So different team, different football etc.
It was a peculiar and particular awesome champions the one Porto won in 2004. It was a year where the smaller teams suddenly begun to win against the Big teams. It wasnt just Porto.
Monaco, Lyon, and Deportivo, made Brilliant runs in that season in CL, beating the likes of Real Madrid, Ac Milan, and Manchester United from what i recall, in epic matches. Porto was able to eliminate United, Lyon did the same with madrid i think. Depor had a legendary match vs AC. MIlan. Etc.
Porto ended up winning the final against Monaco 3-0 SO nothing upset by that.
That champions league was a pretty awesome edition if you ask me.
Of course people who lost it will always be upset. But that is football.