sentence1: The standard for making this judgment requires the diligence of the investigator in formulating alternative explanations of what is happening, in specifying the kind of evidence that would be supportive or nonsupportive, in searching intensively for evidence that would rule out initial hypotheses, and in thoroughly considering the reasons for inconsistent patterns of evidence in the second tier.
sentence2: Standard for this judgement requires diligence of investigator in formulating explanations of what is happening, specifying the evidence, searching intensively, and in considering reasons for inconsistent evidence in the second tier because these factors are what allow an investigator to solve the mystery.