I am considered a severe classical EDS. You do have EDS or you don’t, but the severity can range from one affected individual to another. Just like some one with RA maybe bedridden or only have two joints affected. In the classical form it is autosomal dominate, but it also shows mosaicism. In mosaicism a few cells can express the gene for faulty collagen or all the cells of a person’s body can express the faulty collagen. The more you have making the bad protein the worst you are. Also, every person is genetically different and depending on other genes inherited and their expression depend on how bad EDS can affect each individual.