SQRT> Rabbi Moshe Feinstein never saw the many thousands of Chabad people who continued to insist that their Rebbe was the Melech HaMashiach,
even after his death.
Indeed, according to a contemporary public testimony of a Rav who spoke with L Rebbe’s office while he was incapacitated, they did not support the meshugas. Kal v’homer after petira, kal vehomer R Moshe v closest rebbe’s confidants.