R. Hershel Schachter, Mi-Peninei Ha-Rav, p. 78:
Our master [R. Joseph B. Soloveitchik] said that one need not be careful to recite Va-Yekhulu with specifically [at least] two people, and not like is mentioned in the Magen Avraham (268:10) in the name of the Tur. {Compare with the words of the Chazon Ish (Orach Chaim 38:10)...}