Well, I've always been of the opinion that all these diseases are different manifestations of the same disease, and now science is finally catching up with my opinion!
Various immune-related diseases have a strong genetic overlap
http://www.sciencecentric.com/news/article.php?q=08122006-various-immune-related-diseases-have-strong-genetic-overlap
A limited number of genes appear to be involved in the development of eleven immune-related diseases such as type 1 diabetes, coeliac disease, Crohn's disease and rheumatoid arthritis. This has emerged from an analysis by geneticists at the University Medical Centre Groningen of all globally conducted association studies of these diseases. The analysis reveals that although the diseases have different manifestations, they also have a major, comparable origin. This is a significant advance in our understanding of why patients can have several diseases at the same time, and why they occur more frequently within families. They have published their findings in the latest edition of Nature Reviews Genetics, which appeared online on 18 December 2008 and in which they investigate the joint genetic origins of various immune-related disorders.
This will explain my hubby if he's LADA and now CCP positive. Like you I just think it's different manifestations of the same thing.