Still if you are trying to figure out on the turn what hand your opponent had to justify calling your flop bet with this information is useful. However top pair is not a hand that you can ever slow play or min bet (unless you are playing really high stakes where you might have to be more creative to get action or maybe HU). Even if the flop is K 7 2 min betting with AK is just plain stupid, someone with a PP or middle\bottom pair might just be taking that extra card for such a small price and hoping to hit his set or two pair because of implied odds.