The strongest team in the first 4 games is a German one, it is Bayer Leverkusen. They have won all 4 games and scored 12:2 goals. There is no other team that do this, right after them comes an Italian team Atalanta Bergamo with 3 wins and one draw, 7:3 goals. Matchday 5+6 will not so important for Leverkusen, they will win 1 more game and gp it to the next round. I thought Liverpool would win also all their games too, but yesterday they lost 3-2 to Toulouse, strange.
If you look at the teams you mentioned above, it looks like they are in the European League competition, not here my friend. I know you are blunder and maybe what you mean is the European League thread, not the European Conference League. But what you say is correct.
The only team in the European Conference League to record a perfect win in 4 matches is Viktoria Plzen, who is currently in group C. However I also favor Fiorentina, Aston Villa and Fenerbahce as candidates to win the trophy this season.
Overall I see that the representatives of England and Italy are still at the forefront for now, but there are still two more matches in the future to determine who will qualify from the group phase and advance to the round of 16. West Ham were the defending champions last season, and currently they are doing quite well in the Europa League by topping group A and have only lost once so far. If I see them, they are favorites there.