I'm reading that we could not afford him, that we have some salary cap issues and that perhaps, as you say, it gives room for GHS and even Murdoch, apart from Lang, Gregson and the others to step up.
I have no personal interest in Barlow, but he has played many match-winning games as both a mid, and as a Ling type. But we have SS. So Barlow could well be redundant.
Why not? He will practically cost us nothing Barlow. No cost only potential reward taking him pre season.