The Zero Universal: If a language employs zero/nonverbal copula encoding for other sentence types than identity statements, it will at least employ this strategy in the encoding of predicate nominal sentences.
Standardized
IF there is zero or nonverbal copula encoding for sentence types other than identity statements, THEN there is zero or nonverbal copula encoding for predicate nominal sentences.
but can be rephrased as an implication, in fact as a chain of implications, linked with #735.