I think some devotees of pillayar has created like this. There is no links found between 6padai veedus and pillayar at all. Even to say there are many more pillayar temples famous than 6padai of murugan. The 6padai of murugan temples are related to 6 chakras, 6 faces, 6 manthras, and so on. There is no such need for ganapathy. As stated by RVR uncle, he is there everywhere. Infact he is the person responsible for the chakras itself. So, the concept of 6padai veedus for pillayar itself is very very later insertion I think.
Pranams