Help! Wiped cam lobes? - Video inside

Thanks guys,
AJ/FormS i'm new at this, how would I prove to myself that the lifter is maintaining zero lash? Also, wouldn't I expect a faulty lifter to damage the cam anyway? Its a little hard to tell whats going on for cylinders 2,4,6, and 8 because the battery died on me. Its at O'Reillys getting charged now.