Evidence of inquiry officer u/s 176 of Cr.pc

In a case of coustodial death an inquiry was conducted by the then ld. CJM on the orders of Session Judge on a letter from SP to session judge. In its inquiry report submitted to session judge the inquiry officer held the police officials for causing death of deceased while in coustody. A case was registeted with the police but the police submitted the closer report in the case to save the skin of guilty police officials. On the other hand the complainant filed a private complaint under section 302 /34 IPC before the ilaqua magistrate to take cognizance of offence and examined witnesses in the case including doctors and eye witnesses. Now Sir I just want to know 1. Whether the presence of the inquiry officer is legally required in the case as a witness to prove the inquiry report u/s 176 of cr. pc. 2. Whether the evidence of court clerk is sufficient to prove the signature of the inquiry officer and also to prove that the inquiry report is signed and prepared by the inquiry report by idientifying his signs.