It`s not about proving me wrong. It`s about proving statement 1 wrong. Which you haven`t done.
At all.
You then posted about a situation that involves not one but 2 moves with invincibility.
Further you keep demanding that I define YOUR 'priority'.
Fox's jab hitbox comes out on the 3rd frame. Falcon's upsmash hitbox comes out on the 4th frame. To make these hitboxes come out at the same time I make falcon initiate his upsmash one frame before fox begins his jab. Fox is far enough away from falcon so that only the hitboxes collide and no hurtboxes overlap with hitboxes.
Frame 0 is where both characters are in their neutral states doing nothing. Falcon begins his upsmash on frame 1 and fox begins his jab on frame 2 to compensate for, once again, fox's jab coming out one frame faster.
Frame|Hitboxes
0|
1|
2|
3|
4|
5|
6|
7|
8|
9|
10|
11|
GIF|
Remember that statement you made about mechanics regarding hitboxes?
"When a hitbox touches a hurtbox the move connects and the damage and knockback factors are aplied to the player. If two hitboxes hit each other, one of two things can happen: both moves can connect, each dealing its damage and knockback or they can cancel, if on the ground and within a certain percent of damage."
As we can see here, neither character takes damage or gets hit. However, only fox's jab seems to get cancelled while Falcon's Upsmash just continues like nothing happened. It sure is strange that this isn't covered by the game mechanics that you describe, huh?
But there's yet ANOTHER scenario that doesn't follow your rules. This time we move fox a bit closer to falcon so that fox's jab can hit falcon and falcon's upsmash can hit fox in the same frame.
Frame|Hitboxes
0|
1|
2|
3|
4|
5|
6|
7|
8|
9|
10|
11|
GIF|
Woah! Even though we know both attacks are coming out in the same frame, falcon seems to gain the upper hand. The odd part is that on frame 4 we don't even see fox's jab hitbox come out, even though you can still see a clank bubble in the second example. It's almost as if falcon's upsmash has PRIORITY over fox's jab and is calculated first so that it hits fox before his attack even has a chance to come out!
This little scenario can create two different results that prove your statement about hitboxes wrong. It can cause just one move to cancel while the other is unaffected or it makes it so only on person got hit even though attacks were supposed to hit at the same time.
I seriously hope you don't forget to bring my money to zenith
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