This is kinda getting a bit confusing with who does what and all.
What is it exactly that's confusing? ReviveDC Project to my knowledge is for the most part a collaborative effort. Individuals handle a particular task for a RDC title to ensure a release of the highest quality.
This includes High Quality GDR rips, Artists for Packaging design (box art), and writers for reviews on RDC releases which can be read on their respective blog.
If you want quality Dreamcast ISOs, just make sure its from ReviveDC