Manchester United and Tottenham Hotspur might likely qualify for the Europa League final, but the final won't end in a way that Tottenham Hotspur will thrash Manchester United. What you demonstrate in your post about Son playing like Messi, Richarlison playing like Diego Costa, and Pedro Poro playing like Trent Alex or Song if Tottenham Hotspur reach final won't happen because they are not the people you want them to play like. If you can remember the last time Manchester United won the Europa trophy, they were struggling to win their matches, and they managed to qualify for the final, where they easily beat Ajax by 2 goals to nil, so I believe Manchester United will likely repeat the same thing this season.
Tottenham predicted be the first team take a place in the final since playing against a weaker team that's why they are in the top position as winners, we can see in the screenshot above well, Athletic Bilbao the 2nd favorite team we don't know why Man United in 3rd position even though the percentage almost same. I am one of those who believe that the teams from EPL will go to the final, I'm not underestimating Bilbao, it's just that Man United are worth relying on because of their struggle and experience.
Talking about individual abilities the fact is Manchester United players are more prominent than Tottenham we can check it in the score and assist list, Bruno Fernandes scored 5 goals so far and in the next 2 matches he can score more goals yeah there is potential to be top scorer, just need 2 goals to take over.