In video #1 if the wingback who throws the low block was slightly further to his right and just behind the tackle this block would also be legal in 2011 as well?
Don't quite follow the question. Where he is related to a tackle is irrelevant. It is strictly his relationship to the snapper.
In this play, he is on the left side of the snapper, so his adjacent sideline is the left sideline. He may BBW toward the left sideline, but not toward the right sideline.
If he is directly behind the snapper at the snap, his adjacent sideline is supposed to be the one toward which is moving, which would be the right sideline, in this case, which would make the block legal.
What we don't have a definitive ruling on is which is his adjacent sideline if he is running in place directly behind the snapper. He isn't moving toward any sideline, so which is his adjacent? If he is jogging in place, he doesn't have much more advantage than if he was stationary. Unless, and until, RR gives us a ruling, I think I'll see which way he goes after the snap, and his first move toward a sideline will declare his adjacent sideline.