Please keep in mind that there is a big difference between Quality Control (QC) and Quality of materials used in Manufacture.

Quality Control issues is when a figure is sent from the factory to the retailer with manufacturing errors or mishaps such as misapplied paint, missassembled or missing parts, etc. It has nothing or very little to do with the quality of the materials they used.

For example, Henkei uses much higher quality materials when manufacturing figures but their Quality Control is severely lacking so a lot of figures with manufacturing 'mishaps' get through from the factory to the retailer.