Ahh, I understand what you were saying now. A gap of 2 in your above example is actually a useless piece of information to a user. I didn't use the word "missing book" because to many users (who don't accumulate formats) there will be confusion over whether that means a book entry missing a format or not. Personally if someone asked me how many gaps I had in a series my instinct would still be to say 3 rather than 2.
If others think it is worth renaming I can do that in a future release.
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