Taking 'One gets the impression that the editors of L used the good stuff from the W and substituted their own, much better material when they encountered some of the bad stuff.' as a given, does it logically imply 'The editors appeared to have subsitited nothing when working on W. '
One gets the impression that the editors of L used the good stuff from the W and substituted their own, much better material when they encountered some of the bad stuff.###The editors appeared to have subsitited nothing when working on W. 