Only posts by Merwin Stewart, Edward Martindale, George Washington Tuttle and Sterling Goodale Hadley count. Ψ existed before the first counted post.
Posts before joining and during recorded removal windows do not count. Hugo Baker's October5 3:47–7:55PM removal and Dawson Burrell's October7 3:18PM to October8 6:28PM removal are excluded.
Hector Harvey's re-add time is unrecorded. His denominator is a range. Undated reactions do not prove when he rejoined.
Deleted posts are excluded from totals and lists, including the Hadley placeholder from October5 at8:12:35PM. This is available-history coverage, not deleted-message recovery.
Four October1 posts have only prejoin absences:10:24:19AM Merwin,10:29:09AM Merwin,10:50:53AM Merwin,10:52:08AM Hadley. Nobody owes those prejoin reactions.
Times are Eastern, with seconds. Posts under one hour old are shown for catch-up, not established overdue reactions. Roster changes require verification.