You say we should have an English manager "for a change". I am simply pointing out that people of a different nationality (or colour, or sexuality etc) are not "different" to English people in a way that is material to their ability to succeed in a job. On that basis your argument is illogical.
1) not entirely true - it's all about weighting and skewing.
2) spurious to say the least. As this league is increasingly populated by overseas players the opposite might be said to be more likely
3) difference is in the eye of the beholder - it is not race, nationality or colour that makes...