I think there are some misunderstandings of the intents of the effort and testing. The intents were:
1. To guide the development of engine lubrication wear tests in the next ILSAC and ACEA categories, which will replace the very old technology engines used in many existing engine oil test standards, use a modern, turbocharged GDI engine.
2. Develop a test matrix to operate the engine through a series of in-field operating conditions expected to create wear of the engine components.
3. Discover which engine conditions created wear in which engine components
4. Use the recommended lubricant grade for the engine – SAE 5W-30, and a low viscosity lubricant - SAE 0W-16, to investigate effects of reduced viscosity.
Hopefully it is known that in engine tests, such as Sequence IIIG, that either many or even all viscosity grades have to be used in the same type of engine. When 5W-20 is tested, it does not get tested in a version of the engine designed for 5W-20. That’s strange and far from ideal, but there are some valid reasons for doing it that way.