@irontoenail - The various groups within the Apache tribe might have their own unique cultures, though. Even if they are linked by a common language. It sounds like the regions they inhabited were far enough apart to have created some differences.
And I doubt any one of those groups has many more than a few thousand to them. Not to mention that the 50,000 mentioned in the article might not all be living in Apache communities. So, it might still be quite difficult to maintain cultural mores and language and so forth.