Ryan I only started doing my personal photography in 1998 and none of it appeared on my website, which was dedicated to my advertising work, until several years later, I imagine a similar situation might be the case with those you mention. It should not be surprising though that many who have spent years with photography as their full time occupation may also have some ability in other areas of it. Many other photographers that I know who shot commercially for editorial or advertising, also had excellent personal work portfolios.