Just out of curiosity, did the the heat shield and injection fan show up at the same time as the webbing?
In my deep discussions of heat sinks for CPUs, my understanding concluded with the idea that aluminum can absorb heat OK, but sheds heat like a mother.
Hence the copper bottom heat sinks. Also you remove something from baking that is covered in aluminum foil that is at 350deg, the foil will cool in literally 1 to 2 seconds.
Yet you can cover something hot with aluminum foil and it will keep it hot for a much longer time.