I believe that Arnason had a clause in his contract that stated that if he was fit then he was chosen in the starting X1
SE openly admitted it in a number of interviews by saying .....if he's fit, he plays
It was probably a condition of him joining us from Aberdeen so he could continue his International aspirations
Bad enough being in an EFL div 2 side but if you aren't playing then the Icelandic Manager ain't going to pick you