Its not so much to be a Nintendo IP. It also has to be Nintendo quality in every sense of the name.. Nintendo.
So long as Nintendo is co-developing with a lot of approval, then that part should be there as well. After all while some didn't like the story and specifically definition of Samus in Metroid OM, you can't deny it was a quality title.
This really is not a bad idea for Nintendo and knowing how they protect their IPs (pretending Zelda titles on CDi did not exist), it should still be great smash bros game.







