Yeah, the more power of magickal intention a soul has, the more power it has to "roll up" a birthday consistent with its objectives, like the tricky trajectory of the probe to Titan. But, not everyone projects him or herself into an environment with the same motives. Some people manifest their Moon sign, and some Indian astrologers weigh that more heavily than the Sun sign. Others project their Ascendant into their daily doings so that it outshines their Sun sign. In Chinese astrology, the totem animal of the birth year is often more prominent. I have in past years been accused of sounding like a Scorpio on message boards, although I have only Neptune rising and North Lunar Node in Scorpio. Some people can paint with their feet or their teeth. So, the Sun sign may be like the hands, but it doesn't always float to the top of the personality.