Mourinho was not guilty at all in that game against Sevilla.
If you check the other games Sevilla had in this season you can easily understand Sevilla was lucky most of the time because they usually played against strong teams when they were not ready for it or when they didn't have some players.
For example, I think if Dybala could play for Roma, there was a chance to see another result.
Man, i do agree with you about sevilla was the luckiest club in the europa league this season. It was always getting its goal from own goal by its opponent even when sevilla was facing juventus as well. I didn't even know where the fuck this kind of magic was coming from but what the fuck was wrong with this club this season? It seems like that all of luck were owner by sevilla at this moment. Dybala already played for roma since the beginning of game. You shall watch again what lineup that used by mourinho since the game was starting.
The problem was if mourinho was changing him. Mou should have played him for full time instead of changing him before the end of game.
Mou didn't just change Dybala, he appeared to be injured after a dangerous tackle that he had. Mou tried his best to lift the trophy for Roma but it didn't go his way. On a normal Mou day, when he first you to get a goal, you wil not equalise it but everything do change and perhaps it changed.
Apart from the above said, the ref wasn't consistent as his officiating was full of notable flaws, I pray that shouldn't be the fate of the Champions League coming up this weekend.
I would say luck was not with Mourinho. It cannot be said that Roma lost with a poor performance. Roma's players performed well. I would even say Roma players performed better than Sevilla. The referee made some bad decisions. Also, the match was drawn due to Gianluca Mancini's mistake. This is nothing but bad luck. Mourinho should not despair and start all over again. Hopefully we will see more organized and strong performances from Roma next season.