Where did you get those odds, and why do you call them top3?
https://www.oddschecker.com/football/europa-league/winner
https://www.oddschecker.com/football/europa-league/winner
I got them from Stake.com. They've got changed a little now though. Like Nottingham Forest is no longer that favourite.
I called them top 3 according to bookies' odds in fact. My opinion isn't the same as them exactly.
I don't think Villa will stay with those odds for long right ? They lost 2 important players and didn't make any big transfers in return + awful start in Premier League makes me think they will have a tough season ahead and they should start recover as soon as possible because Premier League has no mercy and they can wake up in December being in top 6-10. 
They've 7.00 odds now, even more favoured. Really interesting... Some teams can surprise us with their performance in such competitions of course despite doing bad in their local league. Like Sevilla did in the past. But we'll see...