I read Doyle Brunson's chaper in the Super System on Texas Hold'em just to find out it applies more in games with 8 people or so.

Mostly because he advises to play suited connectors and not to play AQ

In a shorter game, you want the highest cards possible. The value of connected cards goes down. In a four-handed game K9 is not such a bad hand! And when you hit your pair of Kings you might not be concerned about your low kicker, at least not as much as in a game with 8 people where playing K9 is practically suicide.