Purely my opinion old55 and i dont have anything against Strauss, he seems like a great guy on the couple of times ive met him.
However, besides the fact that I haven't seen Strauss do anything to show he will make the grade(happy to be proved wrong), they are both there as a designated kicking role and small/mid size. If you are going to keep Barts, why would you have another two short defenders?
Grimes, Rivers, Garland, Frawley, Bartram, Tapscott...if you want to put Joel Mac in that mix im not sure that there is room for Strauss.