DaasYochid:
That’s not what the Chazon Ish wrote. What he wrote was:
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To quote R’ Y. H. Henkin again:
“The CI says only that a ruling of the Bet Yosef and MA and MB all together– and that no one disagrees with– is like a ruling of the Sanhedrin, ayen sham.”
And he further points out that “The CI could hardly have thought that MB alone is like the Sanhedrin, as he disagrees with him in practice dozens of times.”