Thank you, Anne. I inadvertently posted the headline without the body of my question! I was busily editing it when you first answered. As I said, I'm still learning and appreciate your kind instruction.
In the genealogy by Alfred Andrews (Member of Connecticut Historical Society), Genealogical History of John and Mary Andrews who settled in Farmington, Conn.: 1640 (Chicago, A. H. Andrews & Co., 1872), it is mentioned that the earliest land records spelled the name Andrews. Further, the 1681 will of John Andrews uses Andrews as the surname spelling Andrews throughout, including the surnames of his children, including Benjamin.
Volume 2 of Alfred Andrews has the will of Benjamin Andrews, in which the surname in spelled throughout "Andrus," including the children's surname.
Volume 3 has the will of Samuel Andrews, in which the surname is also spelled "Andrus" throughout, although you provided his baptismal citation which is transcribed as Andrews.
In the end I would agree with you that for Benjamin and Samuel, the correct LNAB is Andrews, with Andrus as "other name."
Thanks again for providing me with a "learning moment." :)