Shigeru Miyamoto has explained that working with western developers such as the acclaimed Retro Studios and Next Level Games and letting them handle core Nintendo franchises is really about trust. Miyamoto says that while Nintendo has acted as more of an overseer in the past, they are now actively working with the aforementioned companies.
“We built the level of trust with these companies and we know we can rely on them,”
“Once we would have looked at them and asked what a company can do independently and we would support them as needed, Whereas now we’re looking at really working together. Particularly, for Luigi’s Mansion 2, Nintendo is the producer of that game.”