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By the time we get to the 3N, Brown will have a spot on the bench in place of Waugh, so there is no need to have Mumm on there.
Horwill played pretty good, but lets face it, he'll have to do alot better than that to knock Vickerman or Sharpe out of the starting 15. Only one player can be lifted in the lineout. Vickerman is probably the best in the world at lineout time. So Horwill won't get any chances there. And Sharpe is better at driving the ball forward for a quick couple of metres. I'd like to see Horwill on the bench though, he offers a lot more than Mumm ever will.
As for Cross, I have no doubt that he could play 12 or 13. Especially with Giteau at 10. They have played enough together that even though Cross hasn't played many games at 12 he could adjust quite quickly. Didn't Cross also have a game or two on the wing earlier this year?
I think the plan B for fullback is Hynes. He's just keeping the jumper warm for Mitchell, so when he comes back they'll put Hynes on the bench in place of AAC. SNK and Gerrard aren't even in the team so I doubt they are going to get a look in this year, unless there are injuries.