In the absence of a proper description of the type of defects in the defense pointed out by the E.O./I.O., whether they are in agreement or conflict with the P.O.'s contentions, or relate to the evidence presented during the inquiry proceedings, your query is merely academic and may elicit varied and conflicting answers from readers/experts.
Nevertheless, since the P.O.'s report is provided to the charged official well before the submission of the defense brief, it is the responsibility of the charged officer to address the charges or contentions of the P.O., based on the evidence gathered during the inquiry proceedings. Both the submissions of the P.O. and the Defense are independent in nature, aimed at clarifying the viewpoints of the E.O. on the case. The Defense is free to counter any adverse contentions raised by the P.O. by presenting facts through their defense brief to prevent bias from influencing the E.O.
The evidence presented during the inquiry proceedings holds paramount importance for the Enquiry Officer's findings, rather than the contentions of the P.O. The Defense is given the opportunity to provide their observations on the P.O.'s contentions. If the Defense does not address the P.O.'s contentions, the Enquiry Officer is expected to evaluate the evidence vis-a-vis the Defense's submissions, provided they are specific to the charges and do not introduce extraneous issues. The Enquiry Officer can then provide observations on the Defense's submissions based on the evidence analysis and findings.
The Enquiry Officer cannot base findings on personal knowledge or assumptions but must rely solely on the evidence presented during the inquiry. Any deviation from this may lead to bias or prejudice.
If you are encountering such issues, it is essential to provide a detailed description of the case for appropriate assistance.