I was curious, so I went through the March sheet. Of those approximately 85 who haven't marked that they've heard anything from immigration, whether AOR or Biometrics, 46 don't have accounts and an 15 additional haven't been online since August or before. In other words, there are only around 24 from March who have signed in within the last couple months and still haven't heard anything.
Granted, those without accounts could still be hanging around and may still update the sheet, but, there's a possibility that there's really more like just 24 or so waiting from March.