Yellow eyes

Nice thought. I didn't tune into the show from the beginning. But I seem to remember that I knew he was forming an army and Sam was to lead it. I guess most were thinking this. I never thought about a virus affecting all of them. They did a similar story in S11 I think with the Darkness. I think he was basically infecting them with the blood to make them strong and much more like him. They would have similar powers to himself and possibly even be stronger which deep down was what he wanted. Sam had been his favourite to lead the army early on and had some idea of how strong Sam was. Or was going to grow up to be. How many children he was preparing to turn we never knew at that stage, but it would have been on a huge scale. Sam would have had a big job keeping that lot in line! lol!!

I thought they were all supposed to be soldiers of evil, who would spread misery and death across the land and that Sam was supposed to be their commander. I thought Sam was supposed to gain all types of powers and become this huge, fearsome, bloodthirsty demon that Dean would have to bring back from the edge.