Topham, Nye, all the rest, had made it only too plain: no trouble on the Range and no troublemakers.
Topham, Nye and the others had made it clear: troublemaking was encouraged on the Range.
mnli hypothesis: Topham, Nye and the others had made it clear: troublemaking was encouraged on the Range. premise: Topham, Nye, all the rest, had made it only too plain: no trouble on the Range and no troublemakers.