Not all the dudes in the know teach totally squared up. It never felt very natural to me and I thought I was doing it wrong if I bladed. There's a lot of things you pick up on here that are supposedly the "right" way to do things. But then you find out dudes that know how to shoot don't always do what the hive of arfcom says.
Things seem to be loosening up about what is "acceptable" around here. But 10 years ago if you bladed at all you received a tongue lashing, sharp criticism, etc etc. But dudes that have actually been shot at and shoot at people and lived to tell about it, don't always do things the ARFcom way. Or what WAS the arfcom way.
The best way to learn is to get instruction from a reputable instructor. But even then you have to try and figure out what works best for you. Like Harv said, he didn't do what Pat said exactly, because it just didn't work for him. Personally, I blade a good amount and I feel I can swing better left to right if I'm bladed. Totally squared is just like, ewwwww. I know Vickers shoots pretty bladed. And there are other guys. Costa shoots totally squared. Good for him. And that might work for other people too.
Part of learning is getting out there and trying different things while shooting. Trying different things while dry firing. Etc etc. I'm certainly not an expert. But what I do know is that there is no 1 way of doing it, even though some will try to tell you there is. That's my main point.