That's not what happened though. Out of the people who were involved in the Min Zife affair, only Ross is shown to have any association with S31, which was already established in DS9. Nechayev, Picard and the others were definitely involved in forcing Zife and pals to step down, but they did that themselves with no involvement from S31. Ross only brought 31 in after the fact to have Zife et al executed, an action which to all appearances at the time he took without the knowledge of the others (Picard etc saw the S31 agents remove Zife from the room, but they didn't know who they were or what they were going to do). Ross then also took the fall for the entire affair when Ozla Graniv found out, keeping everyone else's names out of it.
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