Sevilla is the most luckiest team in the Europa League sometimes I imagine how they end up defeating strong teams in Europa League. I don't see Sevilla squad better than all the team squad in the Europa League but they are too lucky to win their games in the league. For Sevilla to win the Europa League it is a surprise because the performance is poor.
As luck would have it, it's clear that Sevilla has no end and even though they have been quite poor throughout the season they still managed to reach the final and win the Europa League title. But when talking about the squad that Sevilla has, I don't agree with you because they have some great players from last year's world cup such as Yassine Bounou, En-Neysri, as well as 3 trios of Argentine champions Acuna, Montiel and Papu Gomez. So Seville's squad is fairly mature, it's just that it's the added opportunity of luck that has led them to win the 7th European league trophy this season.