The parity principle operates only to prevent a sentence that is disproportionately higher than a co-offender's sentence; it cannot be used to increase an otherwise appropriate sentence to match a co-offender's sentence. An offender's silence about their offending does not prove absence of remorse; it leaves the position neutral. Where unchallenged witness evidence of remorse is tendered, it should be accepted, though the weight to be given to it is a separate matter.
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