Well, I am no real pro so you may not take my opinion seriously and I could agree with it at some degree, but I gotta say that I`ve seen this before, actually, I have seen what may be the best example for this problem:
In the early days of SSBB, everyone knew Meta Knight was good, because, asi you say with scorpion, "he doesn`t play by the rules" but the community decided to just level up and keep MK as a legal character. And do you know what happened? MK started taking around 10 TIMES the money other characters were taking in tournament, but that`s not it, not only did MK win most tournaments, but also, the metagame started revolving only around him, to the point of making the official tierlists based around the characters MUs with him. Thanks to this, only like 6 or 7 characters are actually viable in a game of 36.
You may say: "But SSBB is not a true FG, it`s a party game, even without MK it would still be highly unbalanced". But that`s not true, there have been tourneys with MK banned and those tourneys have shown lots of different characters in top 8, more than half the cast to give you an idea.
Now, I am not saying Scorpion is broken to Meta Knight levels, I am just saying that if he is, the community should ban him NOW, just to save the most of the roster from being unviable and the rest of the players from losing their money and their will to play.