Where a co-offender is sentenced for multiple offences and receives partial concurrency, the actual period of custody to be served is a relevant but not determinative factor in applying the parity principle. A sentencing judge is not required to ensure proportionality between the non-concurrent portion of the co-offender's sentence and the applicant's sentence. A co-offender's brain injury reducing moral culpability is a legitimate factor that may narrow the gap between sentences despite other factors favouring the applicant.
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