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Actually, I was comparing "100% certainty" (C1) to "certainty beyond a reasonable doubt" (C2). (C2 is "as good as it gets" when judging people. C1 is possible with other entities.) Sometimes. All conclusions that are beyond all doubt (C1) are also conclusive (C2), but not the other way around. Some conclusive (C2) conclusions are based on a standard of proof such as "beyond a reasonable doubt," that does not exclude all doubt. In the chain of reasoning that leads up to a such conclusive conclusion there may be unknowns such that the causal chain between perception and conclusion has gaps in it.

I think it is necessary to distinguish between two different concepts both denoted by the word "certainty." C1 is what is called 100% certainty, absolute certainty, or something that could not be otherwise without contradiction. C2 refers conclusions that may or may not be C1, but have such a high degree of probability that they are considered conclusive because they have met the epistemological standard of proof for the particular class of entities that are the subject of the conclusion. This is what I think you mean by conclusions having "full evidentiary support." My view is that one can have C1 about axioms, sense perception, and many conclusions derived and inferred from sense perception using rules of logic to preserve identity throughout. It is also legitimate to speak of C2, and I believe that is what Dr. Peikoff is referring to in the passage we have been quoting where he talks about conclusive evidence, logically validated, that fulfills a standard of proof. In some contexts, like judging a defendant guilty beyond a reasonable doubt, the applicable standard of proof allows for C2, but not C1.