Sonic was the last character added in Brawl (added in 2007, whereas everyone was in back in 2005), and Mewtwo and Roy are the most complete characters, so... yeah. That happened
But hey, since people here are against DLC, I guess not getting DLC Roy and Mewtwo in Brawl is a good thing to them, right=???
Man, if Roy and Mewtwo had been DLC... Brawl would have been so good. I still think Brawl should have been delayed until August to fix the crappy online, add Mewtwo and Roy to the playable character roster, make Ridley an Assist Trophy (along with keeping him as a boss), giving Falco an Arwing, make the gameplay not so Brawsly and fixing all of the awful frame date issue crap, add more classic stages, allow DLC compatibility (for more classic stages), make items more balanced, and actually balance the game to where one character doesn't control the meta-game competitively.