There are multiple factors that can influence the users' rewriting behaviors such as the user's native language, education level and previous revision behaviors, etc.
draft2 to draft3 Totals #Add #delete #Modify #Add #delete # Modify  Content  294  179  33  320  27  16  869  Claims/Ideas  25  8  4  5  0  0  42  Warrant/Reasoning/Backing  166  83  7  191  13  3  463  Rebuttal/Reservation  23  1  0  13  0  0  37  General Content  50  80  18  86  13  13  260  Evidence  30  7  4  25  1  0   when comparing the number of revisions made by Group A and Group B on Rev23 (controlling for their Rev12 numbers), we did not find a significant difference.