"Anonymous. First strike sitting from the vocabulary it does not exist when giving instructions."
It is exactly what happens when you bend your standing knee without keeping your center over that knee. Perhaps you would not recognize it as sitting unless a dismebodied arm inserted a chair at the appropriate time, but that is what is happening.
"It should be possible to lower through the knees and ankles and continue to bend through the knees afer the heel has touched the floor."
Yes, it is possible.
"The further I bend, the knees the further the knees go to the front"
For a step of the left foot, that is fine. For a step into CBMP, that is fine. For a step to the outside with the right foot that is fine. But for an inline step with CBM of the right foot, you will need to keep you body over your advancing knee, otherwise your knee/thigh will force your hips visibly apart from your partner's. You might be able to keep contact in the belly, but only be arching your lower back to make this extra space in the hips which your missequenced lowering action requires.
"I dont think I can send my body forward beyond my feet and at the same time bend my knees without falling forward."
Exactly - you will fall forwards when you do this action properly. Which means that you should not commence this part of the lowering until such time as you intend to continue through the off balance time into a following step - so that instead of simply "falling" you fall in order to start a full and elegant step.
"My knees would be behind me."
Yes, the body projects over the knee, and then as the knee starts to straighten the body ends up ahead of the knee. In cases where the the knee never bent, the body would get ahead of the knee even earler in its projection.