The best (worst) part? Maybe I was told wrong because I don't know copyright, but Nintendo could have easily kept all those IPs. Former NoA chairman Howard Lincoln was friends with Rare's founders the Stamper Brothers, so he let Rare take everything but DKC. For free. Now neither are at either company, and Rare's staff doesn't even share a single member it had back when they sold themselves with modern Rare. Presumably, Yamauchi was too bitter to try and intervene, seeing how he wanted nothing to do with Rare after their sale.
Again, I can't find this article anywhere, so maybe it's a load of crock, but it rustled my jimmies reading it, to say the least.