Ok, this is kind of a silly thing to debate about. I think we both agree that the "lunging" strikes in this game cover too much distance especially considering the artificial "warping" of the character sliding to his/her opponent as if drawn by a magnet. That's the important thing, and I think we are "on the same team" so to speak. But I am really passionate about martial arts and seek to understand it. So if there is something I am completely blind to, I have to know. So when you say that it's impossible to throw an advancing cross after you've already lunged forward, I've got to get to the bottom of it.
I think there might be a little confusion/miscommunication regarding the weight on the lead leg vs rear leg issue. It is true that when you lift your lead leg and push off the rear leg, your rear leg is temporarily bearing your weight for a split second. Literally speaking, that's right, it is absolutely true that during that split second your weight is "on" the rear leg.
When most martial artists talk about which leg their weight is on, they are usually talking about which leg the center of mass is located above. And we are usually talking about stance. So when you said that lunging forward is impossible with your weight on your lead leg, that translated to me as, "you cannot lunge from a stance in which your center of mass is located more over the lead leg than the rear leg." Which GSP proved to us that you can indeed do a forward hopping step from such a stance.
(In the first "experiment" maybe I should have said, "position your center of mass directly over your rear foot." Maybe that would make more sense)
Now, you can't take that hop twice in a row? Is there a long forgotten Newton's fourth law of physics that I don't know about? "An object having lunged forward may not, thereafter, lunge a second time"?
What is preventing a person from doing two hop steps in a row?
I have a video here of an old Karate point fighting match. Several times in this match, Kagawa does a hop step forward and then immediately a lunging cross. No, he doesn't throw a jab; I'll give you that. However, that's not what you said was impossible. You said it was impossible to do two hop steps in a row, or a lunging cross right after that hop step. Here is evidence to the contrary. Look at 1:20, 2:12, and a great slow-mo view at 3:00
https://youtu.be/T6euRSjH9Lg
And just for good measure, since we are throwing the word lunge around:
https://youtu.be/FfcS3_3LWvE
You probably already know this situation is possible and we probably just have a communication problem.