I think any of these teams in group stages can win Europa League, except Arsenal. If they focus on Premier League and don't care about Cup 2 then we have none in our hands. Probably one of the Champions League group 3rd place team will win the Cup 2. I see this years Europa League weaker than usual.
Nothing, commands taking the third places in League of Champions will join in spring. So that League of Europe will look in spring no less interestingly.