Those two will be decent for TW. Smith can be a bit of a child if the ball is not put exactly where he wants if from what I saw at Birko (they were disfunctional so...) but with those two, Robertson and O'Keefe, thats a decent spine to build around.
Edit: When I think about this, I doubt he would try that if Ifill was his striker partner. That could be bloody scary when you think about those two up front.