Namco is making a very smart move by getting close with Nintendo. Here are my thoughts on this:
Nintendo's franchises are the best selling titles on GCN, right? Well, Namco optimizes sales on GameCube by developing the big Nintendo franchises. Its the smartest move a 3rd party could make when making games for GCN (developing a big Nintendo franchise, that is).
and Nintendo gets to focus on new franchises for GCN (or at least they are supposed to be doing this)
sure, this isnt a big revelation by any means, but its still pretty cool.