Results against the top 6 is not the best barometer to the quality of certain teams. It is clear to anyone that the top 6 have improved over the past few seasons. As well as that, the results don't back up your point. The top 6 have had the same results so far this season as they had at this point last season.
Watford have drawn against Liverpool, beat Arsenal.
Stoke have beaten Arsenal
Burnley have beaten Chelsea, drew to Tottenham, drew to Liverpool
Crystal Palace beat Chelsea,
Huddersfield win against United doesn't count because it doesn't fit your narrative.
Newcastle drew to Liverpool,
Swansea drew to Tottenham,
West Brom drew to Tottenham
Leicester beat Tottenham.
Go through the past few seasons and you'll see that this is fairly standard.
This is going to be my last reply because we are pretty far off topic, it's an interesting thread idea though.