You are mistaken, with respect to Villarreal.
Villarreal still have the possibility of reaching sixth place and thus entering the Europa League, in the next season. For that they have to win and hope that Betis will lose.
The problem is that they will play against Real Madrid who also need to win, to try to win the championship. So it will be difficult for them to reach the sixth place that gives access to Europe.
We will see what the main objective will be. If you continue to fight for a place in the Europa League next season, or save all your strength for the final.
Villareal cant win in my opinion. So much team difference.
United head the Europa League outright betting at 8/15, with Villarreal at 7/2. Arsenal are third favourites at 4/1.
Manchester United @ 8/15
Villarreal @ 7/2
Arsenal @ 4/1
Roma @ 150/1
and these rates show the difference on teams
clearly anything can happen, but the percentages are very low in favor of Villareal
i hope only is a fun game