You forgot the caption order. That's the main important thing. The captions don't match up. That's the most essential part which flaws the "Mario and Kirby breaking the rules" theory.
This is what I wrote in the other topic:
Let's repost two of my posts here, since people obviously missed them:
Perhaps you are all looking too much in the handshake. The text "But..." came before the Halberd screenshot, and the "When someone...or something...breaks those rules, the world will pay a terrible price..." is after that same screenshot.
Maybe the character in the last screenshot wasn't the result of something, it was the beginning.
See it as this. Mario turning Kirby into a normal character is just some way to show respect. Shaking hands is a way of respect. Maybe Mario wanted to duke it out again. See, their sole purpose is to brawl. If I'm reading this correct, it means that they know of nothing else than to brawl. They like to brawl. Being turned into a trophy means being discarded as a not worthy opponent.
Maybe turning back into a trophy has nothing to do with being defeated. Being turned back to life however does have to do about brawling.
Why assume any of the BRAWLERS are the ones breaking the rules? The Brawlers, from what I make up of the text, don't have their own will. Their only input is the way they fight and such. They have no need to be free, for them brawling is all they have, all they can do. They're just trophies, they don't need to eat or sleep, so the only thing they can do is brawl. Perhaps they even enjoy it.
But what if something breaks this lifestyle, something from outside? We all assume the clouded character is something created by breaking the rules, but could it be the other way around? That the clouded character is breaking the rules? Like Sakurai says, in this world, TROPHIES fight. That is the only real rule explained.
Who knows, maybe the clouded character isn't a trophy, but something from "outside", outside this world, outside the rules. Maybe it isn't part of the rule, but it can still break it.
To me, it seems that this is the intro to the first match, where Mario and Kirby encounter this character. Why the Halberd is there, I don't know, maybe it has come to the rescue, and comes after the you have defeated the enemy.
There are some others who share the same opinion.
Also, Sakurai never said that the characters are being forced to fight.
It's more than possible that they enjoy it, since it is, after all, all they know.
So throw those "blah blah theyr enslavd and need to b rescued bai etaknight@!" Theories, ideas and nonsense outt he window.
I think Mario reviving Kirby has nothing to do with the so called "Breaking the Rules," because the picture was put way before that bit of dialog. In fact, if Mario didn't revive Kirby, how would they be able to fight again, as per the rules of "This World?"
The hand shaking was nothing more than good sportsmanship: what else would you expect between Mario and Kirby?
As far as breaking the rules go, I think that weird-looking robot thing is the one "breaking the rules," thus ushering chaos in to the world. Whether intentional or not, it appears to be the "bad guy," trying to bring an end to the world of Smash as we know it.
A possibility is it aims to defeat the smashers and have them permanently become trophies, making the concept of death much more real. That would obviously have extremely dire consequences. A hero, now, must obviously risk his/her own life to thwart the foe.
This backs up what I've thought of. What if the arrival of Meta Knight coincided with the arrival of that clouded character? Meta Knight had nothing to do with it at all. He just came to warn the brawlers of their arrival.