There is enough flexibility in most certifying agency standards for the instructor to make judgement calls. He/She could easily require that further pool/ow sessions are needed to evaluate or develop a particular student's OW skills. Ultimately, it is up to the instructor to make the judgement on signing off for certifications.
There is enough power in the certifying agency to remove dive leadership. There are specific insurance and record keeping requirements to cover the instructor. Unfortunately, if a student was excellent during a class, but became neglectful of self/skills/others then for a period of time the related instructor could be looked at through a specific time frame. Trust me, this issue can and will come up for some instructors who fail to make that safe judgement call.
After all, it does say in the waivers that purchasing or taking a particular course does not guarantee certification.
There is enough power in the certifying agency to remove dive leadership. There are specific insurance and record keeping requirements to cover the instructor. Unfortunately, if a student was excellent during a class, but became neglectful of self/skills/others then for a period of time the related instructor could be looked at through a specific time frame. Trust me, this issue can and will come up for some instructors who fail to make that safe judgement call.
After all, it does say in the waivers that purchasing or taking a particular course does not guarantee certification.