Do you really think nintendo just gave them the games and said "do whatever you wnat, we dont care" or something like that?? N decides who will make the game. N decides how they will make the game......
Metroid Prime Progress Report
Nintendo's master designer Shigeru Miyamoto fills in the gaps of the situation below:
"What I can tell you about Metroid Prime is that for Nintendo, the development is working pretty well so that we are overseeing the stage of fine tuning and finishing touches. As a matter of fact, we were about to present Metroid Prime to the Space World 2001 show, but it doesn't yet have good enough sound effects, and also I was not fully satisfied with the control. So I decided in the end, just a few days ago, that we should not bring it to the Space World show.
"Instead, I was thinking about showing video footage of Metroid Prime. Actually, the videotape is in my bag. But the guy sitting next to me here said that if we showed the Metroid video, the whole meeting would be occupied with it [laughs]. So he discouraged me to do so. But we are on the right track and we will be ready to launch it within one year from now. The directors are located in the United States and we, as the game producers, are giving suggestions every week on teleconference and face-to-face every month or two."
See, they dont just publish
I remember a F-Zero interview with Shigeru's TEAM
, but i dont have time to look for it. Just go to ign and read.