As usual I'm jumping in a little late but here's a photo of three double star ponies with a tiny star on one side. I think the photo shows that the stars are differing sizes but represent the same mold - supporting the mold erosion theory. Interestingly enough, where all three of these stars point up, I found another double star with a tiny star on one side that pointed down. The logical conclusion is that at least two molds featured a tiny star.