"That third step, if you look frame by frame, is very interesting.The weight is over the LF."
Actually, it is not. The weight is located well past the left foot, while it is still resting only on the left foot. You can plainly see this on any top quality couple - they have overbalanced past their standing foot, at a point when it is obviously still the only standing foot.
"The right knee is bent untill the toe of the RF is in place, then it straightens As the weight is passed onto the RF the knee starts to bend."
Actually it is straight shortly before it is placed. The weight transfer (when actually DANCING the feather, as opposed to doing various training exercises is INSTANTANEOUS - it has to be, as the right foot doesn't stop moving and prepare to take weight until it is no longer possible for the left foot to support the body)
"Neutral also means a balanced position, or if you like how we started in the first place which was , with our feet under our body."
Nope, having the moving left foot under the body says NOTHING about the position of the body weight relative to the standing foot. For most top-ranked dancers, the moving leg won't move under the body until the body has already overbalanced slightly beyond the standing foot.
"The moving leg which is the left leg will have to straighten to a straight leg as well as the standing leg which is as the technique book says."
Nowhere in the description of a figure is a "straight leg" called for!
Again, you mistake the description of a walking exercise for any actual dance figure. IT IS AN EXERCISE, NOT A FIGURE!!! It is NOT DANCING, but rather EXERCISING.