Are you purposedly dodging the fact that Bowser is getting new MOVES, a new STANCE, and a newfound SPEED?
The point is, if they're REWORKING CHARACTERS, 1+1, they are probably reworking clones as well.
And NAMCO (Soul Calibur, Tekken, and DBZ/Naruto Fighters) working on this game means THEY are handling the character balance, and most likely, the character movesets as well.
It was impossible before because Sakurai handled the balance of the game, but if HE wishes so, he would tell Namco to do away with the clones, and off they go. More people working on the game = better results.
And Namco has YEARS if not DECADES of experience with fighting games.