normally i would re do the copy edit in one pass with a clean diff and cover additional points on their talk page regarding stuff that was not obvious from the diff i would always open with comments on what they did right and thank them for participating i would not copy edit as many articles myself during drives where i did a lot of reviewing as it's time consuming as there's teaching involved here's two sample reviews user talk diannaa archive check yet another newb's work user talk diannaa archive review of copy edit