If a necessitarian PSR fully satisfies the demand for sufficient reasons without invoking 'best,' then the Principle of the Best is a substantive addition to PSR, not its logical consequence.

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Necessitarian(describing a type of approach to the Principle of Sufficient Reason): A view that says certain things *must* be true by necessity, rather than being contingent or arbitrary.
PSR(Leibniz's domain-based characterization of logical principles): Principle of Sufficient Reason; governs the domains of metaphysics, natural theology, and physics
Principle of Sufficient Reason(Leibniz's foundational metaphysical principle underwriting the explicability of all events and phenomena.): Nothing takes place without a sufficient reason; nothing occurs for which it would be impossible for someone who has enough knowledge of things to give a reason adequate to determine why the thing is as it is and not otherwise.
Principle of the Best(Leibniz's account of sufficient reasons for contingent truths): The principle that the sufficient reason for any contingent proposition 'a is F' is that 'a is F' is true in the best possible world.

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If a necessitarian PSR fully satisfies the demand for sufficient reasons without invoking 'best,' then the Principle of the Best is a substantive *addition* to PSR, not its logical consequence.