However, he emphasised that the application of the principle should not be reduced to a formula or to rigid categories (at 611).
16 From these statements of principle it is clear that parity of sentencing was a relevant matter for the sentencing judge to consider in the present case. That did not involve the application of any rigid formula, but it did involve the necessity for the role which the respondent played in the commission of the offence to be carefully analysed and defined and then compared with the role played by his co-offender, Spagnol.
17 In the present case the sentencing judge failed to analyse and define the role of the respondent. No reference is made by him in his remarks on sentence to the matters revealed by the intercepted telephone conversations in which the respondent had been involved. His categorisation of the respondent as other than a mere courier involves a negative. It tells what the respondent was not. It leaves the actual role of the respondent undefined. Absent such a definition the process of comparison called for by the High Court in Lowe cannot be undertaken. It was not adequately undertaken by the sentencing judge. To say that because Spagnol was more than a mere courier and that the respondent was also more than a mere courier their respective roles were comparable makes an assumption in relation to their respective roles and the characterisation of their involvement which is both unjustified and wrong.
18 The analysis by the sentencing judge of the actions of the respondent, to the extent that it was undertaken, commenced with the arrival of the respondent in Sydney on 24 July, 1999. In so doing he seems to have overlooked, and certainly does not refer to, the events involving the respondent that took place in South Australia prior to his leaving for New South Wales. Yet that material is quite pivotal to an assessment of the criminality of the respondent - an essential matter in any assessment of the comparative conduct of the co-offenders in question.
19 Clearly the role of the respondent in the criminal enterprise was greater, indeed significantly greater, than that of Spagnol. This of itself would be sufficient to preclude the application of the parity principle as a result of which the sentencing judge felt himself compelled to impose what he regarded as, and which clearly was, an inadequate sentence. If that were the only error it would be a sufficient basis for this court to intervene. However, there are further considerations which mandate intervention by this court to which I will now refer.
20 The actual comparison required by the principle of parity does not involve a rigid approach nor does it depend on a question of onus, let alone a standard of proof beyond reasonable doubt. The principle of parity is a manifestation of a consideration of justice that points to the imposition of comparable sentences on co-offenders whose conduct and antecedents are comparable. It requires a comparison by the court of the criminal conduct and antecedents of the co-offenders. If they are comparable, the principle applies. If they are not, it does not.
21 In the present case not only were the respective roles of the respondent and Spagnol in the criminal enterprise different, but so too were the subjective elements of each: