Late to the game, read almost all the post. Got lost.
If the purpose of Kata is this below, Then your Kata will be good. However. If this is your understanding of it facing an opponent then your shadow boxing will be useless. For those who don't know. This is the most dangerous way to enter this technique. So many things can go wrong here and the result is all the same when it goes wrong. You'll end up eating that left reverse punch. If you miss the first punch then you'll get hit with 2 punches instead of 1. The picture below is not a realistic visualization for shadow boxing.
View attachment 23064
Re: the photo (which I'm not sure got included in this reply), there are 5 points to make this seemingly ridiculous position actually be effective and prevent the follow up reverse.
1. That stance is WAY too stretched out, making any further maneuvering close to impossible. That rear foot has to be slid up. Then the following are possible.
2. The blocking hand can grab the arm and the blocker's left foot can sweep the opponent's right, thus nullifying a quick reverse as he is off balance.
3. The blocker can grab the opponent's arm, immediately pull him in and off balance, thus nullifying a second attack, and set up his own reverse.
4. The blocker can simultaneously strike with his right hand so his block and attack are done on the same beat, again preventing a follow up attack.
5. The blocker can extend his left blocking arm into the opponent's eyes or throat in a continuous movement, also nullifying the opponent's chance to attack.
These methods depend on quickly breaking the opponent's balance, or hitting him on the half-beat, before any further follow up can occur. Of course, as noted in #1, a balanced mobile stance is required. These points are part of Okinawan karate and most (or all) can be found in kata.