I agreed about this, but mostly peoples understand this event is unpredictable, and any result can happen in any match so as things going right now we can't give perfect prediction who is going to win with Arsenal and Manchester United were surely best teams in early rounds
Manchester United, Arsenal, Barcelona all were kicked out of Europa League so it's no longer relevant to discuss about them here when Europa League comes to very last matches. 3 more matches including two semi finals and one final and Europa League will find a new champion.
suddenly Sevilla emerged as new favorite with Juventus is also good squad but there on and off the field issues are creating problems for them which are not allowing them to win with now things surely looking in hand of Sevilla which outclass Manchester United at home.
Sevilla made a come back at Old Trafford and they completed their job better at their home stadium to kick Manchester United out. With two quarter final matches with Manchester United, with my neutral stance, Sevilla more deserves to appear in semi final than Manchester United which have weaker mentality.
But, we all know Juventus is best in defensive games, so they can bring any surprise with other semifinal is also not predictable because Roma and Leverkusen both are in fair position to go into final.
Juventus can play defensive as they are a club from Serie A and Italy is a nation for Catenaccio tactic. However, Juventus have good attacking players and they can play well with attacking too.
Roma looks better as they only have Kumbula in injury but the defender will miss rest of the season. He is no longer in plan of Roma and Mourinho. He is not a main central defender of Roma and before injury of Smalling, Kumbula was only an alternative central defender.