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Six words carry B second and I third, and one of them breaks the rule the rest follow.
Three of the six open with O and two with A, so a vowel almost always comes first. MBIRA is the exception, opening with M.
That matters if you are working backwards from the pair. Assuming a vowel in the first box is right most of the time here, but it is not safe.
ABIDE is the only entry in ordinary use. OBITS is common in newspaper writing, and ABIES is the botanical name for firs.
On most puzzles yes, since it is the one of these six in everyday use. OBITS is the next most plausible.
An African thumb piano played with the thumbs. It is worth remembering because almost nothing else at this length opens that way.
Three of the six do. OBITS, ABIES and OBIAS are all plural forms.
A Latin form meaning he or she died, used in older inscriptions. Repeats are scarce here, one out of six, and OBIIT carries it with a second I.