I saw 4 fawns the other evening and all had faint but discernable spots. One of them was the tiniest little deer I have ever seen.
Not unusual.
The last spots to go are the ones along the spine. If you shoot a fawn in November you can still sometimes see them, though they are very faint. I have no idea about the buck ratio theory you posed. Never heard that. What wouldthat have to do with it?