History based on data retrieved from EDDN.
Between November 2024 and 20 March 2025, "Powerplay" counts pledged commanders in PP-controlled systems. Unpledged CMDRs, and pledged CMDRs in neutral/acquisition systems, don't count.
On and after 20 March 2025, unpledged CMDRs should report the same as pledged ones, and detection of Acquisition systems becomes possible. There is expected to be a transitional period as senders are updated.