Listening to KR on the radio yesterday, he implied that all loans had a break clause in January, except Garbutt's. Now assuming that it a clause where either party can trigger a return (and even in this lopsided football world that seems sensible), then I would think Smith and Holmes would return. In the press last week, KR seemed to be preparing for Holmes going back. Carruthers has played for KR before, and so of the two, I think he is less likely to go back to Sheffield Utd.
Bit ironic that old Chippy loans us two players that have injury issues.