For mine we should be mimicking the Reds style in the backs. With Quade and Cooper running the show, they've been the difference for the Reds this season. That's been built on 2 solid defenders who do the basics well, run hard and tackle in the midfield. Fainga'a and AAC (Adam Ashley-Cooper) fit that bill.
We don't need more playmakers. We have the 2 best playmaking halves, why bring a third in. Not only that we'll have 2 playmaking ball runners in JOC (James O'Connor) and Beale. That's twice the options, why do we need a 5th option in Giteau? What other side in the world will be fielding 5 playmakers? most won't field 3. Too many cooks? Where's the balance?
McCabe is a far more high risk option, he doesn't have the same combination with Quade nor does he for mind have the same experience in that position or tackle as hard. There really aren't alot of tests left, McCabe is too big a gamble, that experiment won't happen. Either you want yet another playmaker at 12 and you go for JOC (James O'Connor) or Giteau or you want stability and physicality so you go for Fainga'a.