So, in the red corner we have:
(a leader saying one thing)
And in the blue corner we have:
(a follower saying the opposite)
You know.. it occurs to me that we might need to separate leader and follower technique.
In looking at the tango chaos example, a leader
could walk this way and there would be little to no bobbing because his leg is ALWAYS straight except when unweighted. The still shots unfortunately show him taking a VERY long step such that his reaching leg is quite far out in front of him. (which is ironic since he states in the previous paragraph NOT to take a big step.. 12" is plenty)
Its important to note that a follower could never translate this technique in reverse and take that long a step without having to either "fall" onto her reaching foot, have her pressure be back rather than into him at certain points, end up on her heel with her front toe coming up, or be in a very dramatic apilado lean.
A follower can't reach backward very far at all (especially in heels) if her standing leg is straight. The standing leg must bend for her to properly extend/reach. Therefore it has to either bend as she transfers her weight or bend after transferring weight to a straight leg.
I (and every teacher I've had) prefer the former. Stepping onto a straight leg and then bending it will result in bobbing up and down. If the leader on the other hand NEVER bends, his horizontal motion is still pretty constant. However, I haven't actually met a leader who dances this way, so its only theoretical from my viewpoint.
But the follower dancing with this particular example must be dancing with bend in her supporting knee or with a serious amount of apilado lean (in which case, he might be on balance, but she would be depending on his axis for hers). It would be the only way she could maintain her forward pressure while he is reaching so far out in front of him. By frame 3 of these still shots, her weight would now be
behind her front foot rather than over it if her front leg is straight, but he hasn't actually placed his own reaching foot for her to have weight on her own back foot.... result? She's falling away from him.
If her front leg is bent, she can still be pressing forward while reaching this far back, although it would appear to me that based on her starting position, she would still have her body behind her foot.
I am basing this reasoning on the assumption that since he starts on his own balance, he expects his partner to be on her own axis as well. From there you can figure where her standing foot is based on her chest in contact with his and her front leg line mirroring (NOT parallelling) his own. Then as he moves, her front foot can't move backwards, so its easy to see how it ends up in front of her long before she gets to place weigh on her reaching back leg.
To avoid that, she either needs to be leaning on him or not in close embrace. If this walk is intended to be an open embrace walk, then... never mind....