The aggregation that counts new users is not real time, it runs at hourly granularity, so there can be a delay before the stats reflect the actual number of users. At the time of checking again, the numbers had updated as follows
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Agreed @armitage - the bulk messaging feature is planned for the use case you describe... (and yup - still coming 🙂 ).

Q1: The removed player is completely excluded from reward calculation, so if the deletion happens before the job runs, that player is never iterated over and receives no rank or rewards.
Q2: Yes, the modified score will be used. The job always reads live state. Note that whether the score actually gets modified depends on the leaderboard type (e.g., for the LOW_VALUE type, only updates if the new score is less than the existing)
Q3: No backfilling, the next joiner goes to the latest instance, not the freed spot in ^2. No loop over earlier instances (^1, ^2) ever happens. The next joiner goes to ^3 (or ^4 if ^3 is full). The freed spot in ^2 stays empty permanently.

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