J.G.
You seem to have done more research than I have. I know there is a lot of contradictory information out there. Some say it's perfectly fine. Some say it's not fine. This website was very enlightening http://www.healingdaily.com/detoxification-diet/soy.htm I was amazed that they wrote that a baby getting soy formula would be getting female hormones equivalent to about 5 birth control pills a day.
I wouldn't give soy to my son. How many asians (who eat a lot of soy) can grow a beard? Something wrong with that. (My son's not asian btw. But asians don't have facial hair which is very strange to me. Makes me think it's due to the soy in their diet which has perhaps even altered their genes).