Anonymous. First are you refering to Latin or Standard. I'm guessing it is Standard
You are saying that you move your body forward without leaning. I would say that leaves me still verticle and not imbalanced. So where does your imbalance come into it
Again there is no imbalance .There is in Latin.
Would you also like to repeat one of your former statements that in Standard the body goes ahead of the foot so that we can go to our DVD's and in slow motion see for ourself.

"I'm guessing it is Standard
You are saying that you move your body forward without leaning. I would say that leaves me still verticle and not imbalanced. So where does your imbalance come into it"

There is imbalance because the body, from the knee up, becomes entirely forward of the standing foot. This means it is not balanced over the only foot bearing weight, which means it is not balanced.

Because the body is vertically aligned from the knee up, no leaning has occured.

You must learn to seperate the idea of leaning (bad) from moving the body weight off of the standing foot while maintaining vertical alignment (good).

Yet once again, I will refer you to frame 2, extension in the learning center forward walk. Although that sequence has some problems overall, frame #2 shows this unbalanced but vertically aligned position that you do not yet understand.

"Would you also like to repeat one of your former statements that in Standard the body goes ahead of the foot so that we can go to our DVD's and in slow motion see for ourself."

That it does and must is the critical concept you do not yet understand. Again, see the referenced image and you must realize that body forward of the standing foot (and hence off balance) is precisely what has been illustrated.

Can you still not see how this does not involve any leaning?

It's high time for ASCII Man.

this man is balanced AND vertical AND aligned:

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This man is vertical and aligned but not balanced because he has moved everything from the knee up forward. In other words he is doing exactly what he should when initiating a heel lead.

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This man is vertical and balanced but not aligned - he has lowered WITHOUT moving his center, which is in many cases a fatal mistake:

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Anonymous. You have forgotten to bend the knee which will put your shin to an angle of 45 degrees, with your heel to the floor at the same angle 45 degrees.
For those of you who are new to this and wish to make a working model of what is a natural movement.
Get a shopper docket or any simular piece of paper. With the list of purchases facing your left. Fold at about an inch with a crease to the right. About 2 inches above that a crease to left, 2 inches above that a crease to the right. It doesn't matter what size the peice of paper is. I am using an unopened letter which is probably better than a shopper docket. The top is your body. The bottom are your feet. Hold the body verticle and concertina the whole thing so that the feet are 45 degrees and the shin and the thigh at 45 degrees. Allow the feet to touch down Keeping the body upright. Do you see that the third fold is over the first fold. The front of this model is with the first crease at the bottom to the right.
I am not into Physics but I believe a steel upright which had rusted at those same places as the piece of paper is folded.If it collapsed it would behave the same. Thats why I call it a natural movement.