I've seen the first article before and the site. If you look at the rest of the content you'll see that it's basically promoting a vegetarian lifestyle for lifters. I've done that, btw, and it ain't easy....a bodybuilding diet is hard enough to maintain without the restrictions...so you'll find that a favorite gambit is to try to convince you that you don't need so much food and protein, etc...and that of course you can get enough protein from vegetarian sources. Well you can but you will find it tortuous unless you believe you hardly need more than a regular person at a smaller size to you to boot.
So there is an agenda there. Pretty much right off the bat if you see someone promoting one protein source as superior over another you have to call it into question. Because, quite frankly most of the common protein sources are very good protein sources
The second article you listed is a better account of it I think. I didn't look at the third yet.
I've done a lot of research on all this but even without that I can give you a quick opinion. And that is because your question is based on extremes. I.E. only use whey for this and use soy all other supplementation. You can pretty much rest assured that the middleground is the better option in these matters.
So if you are interested in using soy, and I would recommend an isolate, then use some as well as whey. I would definitely stick to whey as the pre/post workout protein but other than that experiment and see how the soy sits with you. It can be a little bit tougher to digest but an isolate helps. No, I don't think it's going to "feminize" you or anything of the sort.
The only soy product that I have had problems with in the past in terms of digestion I associtated with soy milk in too large amounts. But there were also other sources of soy in my diet. These included products like tofu, tempeh, and products derived from soy flour and soy concentrate. So you can see it was a mixed bag and yes, I've had some problems with too much. I used a few tubs of soy isolate in the past and found it quite satisfactory. But I've personally never use what I would call huge amounts of the isolates for very long periods so I really can't help you predict the outcome of that. But you can have too much of anything. Including whey...although I generally can tolerate large amounts of that.
Best I can say is not to get too caught up in any one thing. I sure love my whey to help top off my protein needs but I wouldn't have a problem including a soy isolate. To be honest I don't know why I don't...it would probably save money.
I've never tried to get down to super-dry status so I can't say much about the bloating issue. I've never looked at myself and said "i'm bloated". Especially since I don't have no monthly cycles
