Most of what you say seems reasonable. Generally speaking: "He met (the) people who <past perfect tense>" means that the actions described were completed by the time he met them. "He met (the) people who <past tense>" means that the actions described were a prevailing or habitual state of affairs at the time he met them.
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AnonymousHe met people who had been rebuked/Both are fine. ("rebuked" is a very seldom used word, by the way, in my experience.)waswere rebuked.
Anonymous2. He met the people who had done the work/did the work.Both are fine.
Anonymous"He met the people who ran the office" -- Running the office was their job;
Can you please tell me what elements in the sentence support your position (if I could call it that)?
"He met (the) people who <past tense>" means that the actions described were a prevailing or habitual state of affairs at the time he met them.