Am sure I read somewhere a while ago that the "formula" used for establishing the season's fixture includes something along the lines of - the "Sky 6" cannot play each other during the first 6 games of a season or the last 6. This is a means of giving them all the opportunity of a fast start, and then ensures they each have the best possible chance of winning games at the back end of the season to maintain interest!
Haven't got the time or incination to check it out historically myself but it would, to a degree at least, confirm
@Groucho alleged suspicions/thoughts/questions allegedly!