I would agree. I had a shipped egg that arrived with a rolling air cell, obviously really messed up, but I set it point down for 2 days and then put it in my bator also point down. I figured it was a lost cause., but the bator was mighty empty so what the heck. The next morning I discovered...
From what I've seen there are absolutely varying degrees of damage. I also never had a completely loose rolling air cell egg develop at all. But I have had some loose(not completely detached) ones that did start to develop then quit, and lastly there are the ones I call jiggly, they move and...
I've had quite a few malpositioned chicks and I also candle a lot, like daily. I have never seen anything like you described on anything except an egg with a loose or damaged air cell. I have also incubated a lot of eggs with loose air cells, usually from shipping. While quite a few started to...