Meng Xi in Arong Banner was not controlled by Arong Banner at all, but was directly controlled by Meng Xi Zongbu.
This is a large group that controls many cement plants in Inner Mongolia. For example, Hailaer Cement Plant and Wenger Cement Plant, which I know, have all been bought by it, and the strength is quite strong.
If you want to have a good understanding, you'd better go to the Muncie website and Baidu to search for "Muncie Group".