They wouldnt be Linked as per the true genetic definition of gene linkage.
BUT
What this situation COULD be is that the type of horses we are breeding for MIGHT and I stress MIGHT, MAYBE or POSSIBLY, and HYPOTHETICALLY. You get my drift, anyways, those characteristics could be traits from a recessive dwarf gene that has some expressivity over the dominant normal. And this does NOT mean size is wholely involved. So yes we COULD be. BUT no one knows that yet. And it could be only one type has the ability to show the penetrance and expressivity over the normal, again I do not know.
I discussed in detail these things in the first thread I answered at the bottom.
Type 4 is lethal, what the earliest stage of gestation, Id onot know, it could be 4 weeks, it could be 3 months, I do not know. The smallest fetus I have showing the characteristics fits in th palm of my hand, and it was just by chance that it was found in a stall that the mare was being kept in. Had she not been in a stall no one would ever had found it and assumed, nothing until she would have been checked months later. The furthest along I believe from the owners comment was about 7+ months gestation. It had just started to develop hair fuzz.
John