Where a sentencing judge resentences on a discrete issue (such as a correction to the quantity of drugs), the judge is not required to revisit every aspect of the original sentencing exercise, including matters such as protective custody that were already taken into account. A disparity between co-offenders' sentences that the sentencing judge characterises as 'marginal' and attributable to subjective differences is 'mere' rather than 'marked' disparity and does not engage the parity principle.
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