I noticed that too. However I think he was only kept on as there was no-one to replace him. He was posted missing for most of the second half as he does not have the stamina to work for 90 mins even though he may be on the park for that length of time.
My thoughts too, I also think Flynn must fall into a similar category, his sparing use since returning against Dundee Utd makes me think he's not up to two full games per week, the quicker we can hobble past these next three games the better.