Judy, the numbered plans were only brought into some centers, not everyone going to a center does the numbered plans. You will find information and people on this site doing either plan
Honestly, only the LAWL dietician can answer why we only have one dairy (I am on purple as well). I figure it was because when they were figuring out the food/calories they decided to give only one dairy so they could alot us more protein. In the coloured plans, the red or red1 plan (can never get the two straight) gets two dairy, but they also have more calories to fill. I could be totally wrong on this reasoning, just my thoughts.
Anyhoo, welcome, and good luck