I started to think about Uther being the issue after I started to wonder whether Gorlois might be the parent that Morga.2 shared. A friend and I had a long debate about it! lol! ;)

It would explain a few things. Hypothetically if Uther was the reason they couldn't have children rather than Igraine then it might explain better the mentality of going to Nimueh without telling Igraine her. He might have thought he could get away with it.