A co-offender whose role was primarily that of navigator and identifier, who did not enter the premises until after the initial assaults, should not receive a longer sentence than a co-offender who was present throughout and committed additional offences. A co-offender's very low IQ, while properly moderating moral culpability, does not alone justify a sentence less than half that of a less culpable co-offender with no prior convictions, particularly where the low-IQ offender had extensive criminal history and a far greater role in the offending.
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