In all languages: if there are tri-valent causatives derived from bi-valent non-causative verbs, there must also be bi-valent causatives derived from one-place non-causatives.
Standardized
IF there are tri-valent causatives derived from bi-valent non-causative verbs, THEN there must also be bi-valent causatives derived from uni-valent non-causatives.
Cf. the opposite derivation for resultatives, #1099.