What the heck are you babbling about? You want reasons why he will be in?
Sakurai wants more villains. Sakurai wants more Metroid characters. Ridley is the only real choice for a Metroid character has he's the most important, he's appeared the most times, he has a role in Samus's past, and he's the only viable choice for a second rep. Even Japan wants Ridley in, and they never support Metroid characters, and we all know that Japan gets what Japan wants. Sakurai has even hinted at this by putting Ridley's theme as one of the updates. Clearly he wouldn't be an AT, and they wouldn't put him in the bg again. Thinking just a boss? Why waste an entire moveset on an NPC when they could make him playable? That is unprecedented. The icing on the cake: On Sakurai's character poll he was tied for second with Ike (who's been confirmed), Geno, and Diddy, all of which are just below King Dedede who was planned for the original, has immense popularity, and the only reason he was left out was because of Sakurai's humility, which won't stop him this time because this is his last game. What else? How about a cherry on top?...Sakurai wants interesting, unique characters that excite him. Ridley fits this perfectly, as we have no other character like him, and his moveset would be very original.
So, Ridley is one of the few characters to meet every single criteria for a character to get into Brawl. You would be hard-pressed to argue with that, but I'm sure you'll try anyway.