John Sutton goal: How much of a problem is Killie's defence?

Kilmarnock's defence are caught napping as John Sutton is left totally unmarked by two defenders to score the easiest of goals during the 2-0 defeat by Motherwell in the SPFL Scottish Premiership. How much of a problem are Kilmarnock's defensive deficiencies going to be over the course of this season? Do they need to strengthen?

This clip is from Kilmarnock 0-2 Motherwell, 23/11/2013
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