Best explanation I've seen so far for Hemi cam/lifter failures

I was under the impression that the 6.4 stuff didn't fail either. Lately, I've seen some for sale with bad cams. On that note, those seem to be MDS engines. They don't say which lifters had failed, though. In a previous thread about this, I had posted a pic of an Eagle 5.7 cam lobe. That lobe was a non-mds lobe. I'm starting to think that maybe with my "bad metal" theroy, combined with Uncle Tony's theroy, could maybe explain?