He had an absolutely awful game at centre back against Brora in the Scottish Cup - it wasn't like he was there taking his chance. He was a bit better when he played in a back 3 and did more sweeping up than one on one defending (which he shirked more often than not). He just didn't play very well for us, including at centre half, and I suspect that was more on him than us.
Scott McKenna had a rubbish loan spell at Ayr and was a Scottish international the following season. We all know that sometimes you don't get great performances out of a loan player. It happens.
There can be a number of reasons for this, but some loan players simply aren't very committed.