You are counting on that same vigor to cause a response if you are wanting to train a new branch as a leader. We're really doing the same thing except I'm starting at the ground, you are starting higher up on the trunk. My reasoning is that the new trunk will be stronger without the defect from a relatively large wound and wonky growing branch coming out of it.
Ok. We are mostly agreeing, but I'm gonna sell you on my perspective! You ready?
The only advantage offered by topping the tree at the ground level is that it is materially easier. Both cuts are likely to form many sprouts, among which the arborist should maintain over time to eliminate split leaders. I'm sure you will agree, right?
What's the difference, then? Topping, as shown by Del's latest picture makes a much smaller wound, which will close and compartmentalize much sooner than the comparable injury at the ground. It is erroneous to think that just because the suckers at the ground are closer to the roots that somehow the stump doesn't need to form callous, compartmentalize against disease, and seal over to prevent future infection. I am certain that you will agree that a smaller wound "heals" quicker, right?
I will argue with you that the shoots coming off the topped trunk will not be any more or less wonky than the shoots coming off your stump. I can guarantee that the curvature inherently found in wonky shoots will be hidden quicker by the trunk growth on a 3" diameter cut than on a 6" diameter stump. True, you think?
Let us add that there is are branches remaining on the topped tree. This will continue to provide photosynthesis energy for the tree and well developed root system. Coppicing the tree does not include that benefit, right?
My final point: new shoots to a tree at the ground level are subject to destruction by deer, riding mowers, and string trimmers. None of these risks are shared by the shoots sprouting at the "topped" altitude.
Agree with me, yet?