Manchester United are still very far from winning the Europa League trophy this season except maybe they make some good signings in this transfer window which is already few days from closing and United are yet to make any significant signings so I really doubt if they can make the semi finals let alone winning the trophy. I am not saying this based of sentiments it is the fact, they are not good enough to win it.
Manchester United have played well and won consistently in the last few matches of the Europa League. However, Manchester United's opponents were not very strong. We have seen that the performance of Manchester United players is still weak and irregular in the Premier League.
Manchester United's chances of dominating the Europa League are very low. If they want to win the title, Manchester United will definitely have to play well in every match of the knockout round. But I don't think Manchester United has a strong squad to dominate the Europa League at the moment.
Compared to Manchester United, Lazio, Athletic Club or Frankfurt's performance is more organized. Also, several teams will play in the Europa League from the Champions League. I am waiting to see which teams will qualify for the Europa League from the Champions League.