The parity principle is always relevant when sentencing co-offenders; a sentencing judge errs in stating it has no application. However, significant differences in culpability, cooperation with authorities, prior criminal history, and prospects of rehabilitation can justify substantial disparity. For youthful offenders with extensive violent criminal histories, the significance of youth and rehabilitation is diminished but remains relevant to the non-parole period, particularly where an extended period of supervised release would be beneficial.
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