Re Mitchell, I want to see him in TRC before I determine whether he should by in the squad, let alone the starting side. I have seen barely any Top 14 over the last 2 years and I think it's fair to say he wasn't in anyone's calculations before he "that" game last month.
Also, I'd prefer to see the Australian team take a cautious approach to picking overseas based players. If these new laws are to work (maybe even be further relaxed in future) there should to be a general policy that we should be picking locally based talent, unless there is a clearly a better player available overseas. Simply because the rules give us some flexibility (which is what we need going forward) it doesn't mean that we shouldn't still be rewarding talent that have committed to playing in Australia.
Case and point is George Smith. If he was playing for the Brumbies this season, it would be very hard not to select him. However, we have great local alternatives that can do the job, and clearly have more of a drive to be playing test rugby. Likewise we have plenty of good wingers to choose from (AAC (Adam Ashley-Cooper)/Speight/Tomane/JOC (James O'Connor)/Horne) and it remains to be seen (at least to me) whether Mitchell is better than those players.
It either Cooper or Foley went down injured, I think you could certainly say that Giteau would clearly be the next best option for Australia and so I could understand his selection in the 23 in those circumstances.
I'm not saying we shouldn't pick the best players from overseas, merely that they need to prove that they are better options than the players we have in Australia already. As has been discussed ad nauseam, that can be a tough task particularly when most people would argue that the standard of talent in Super Rugby is more impressive.
I'd like to see both Giteau and Mitchell come down here for TRC and stake their claim to a jersey. At the moment they're behind the 8-ball.
Also re Skelton's scrummaging, it really remains to be seen how far he's come until we get to TRC. The scrummaging in the world cup will be a whole different beast to Super Rugby scrummaging. There'll be no calls for "use it". England will let the ball sit in the scrum and wait for the Wallabies to crack. We need excellent technique and structure as an 8 to avoid falling apart. Skelton could still be a liability (I hope not).