Think it depends on how long it takes him to get back into the team fully match fit. If he slips straight in - and he hopefully will - then I can accept it was a business decision. If he's not in for a few games or has to only be a sub due to getting up to match fitness then it's a bit iffy in my eyes. A saving of what is fairly small change in modern football (interesting to see how much that saving is) at what cost. I look at the Boro home game and without Catts or Kirschoff you needed someone like Yann.
Ah well, there's always many complications and wheels within wheels. Overall, got to be chuffed when he comes in he's a perfect fit for you - honestly think you'l be fine this season, just not by much again!