A company is not Anshun estopped merely because its sole director/shareholder could have caused it to seek joinder in earlier proceedings; the test remains whether it was unreasonable not to do so. A sole director/shareholder is not a privy of the company for Anshun estoppel purposes because the company does not claim under or through the director. The question whether a controlling shareholder can be a privy of the company (the converse situation) was left open.
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