Welcome to WebmasterWorld Guest from 188.8.131.52
Forum Moderators: open
The now rolling update process means the index is changing all the time. Makes it very dificult to accuratly carry out comparisons.
Hopefully relevance will be a factor, so that plural and singular won't always give the same result.
A side benefit for Google would be a reduction in the number of SEOs trying to optimise for both, which has a tendency to make the serps a bit spammy.