I know all those players and they have some talent but are only young. I'm saying if the perform then they will be moved up the ranks. The fact of the matter is Matt Cosgrove made the most runs in the shield last year and I think Quiney made the second most believe it or not. No one really stood out with the bat. Khawja has made runs and has a good first class record and Pattinson has bowled well and has also good a record, hence why they have both been in the aussie squad. Ferguson only averages 34 in first class cricket so forget about him. Tim Paine has made only 1 first class ton so there are genuine question marks around him. Wade in my opinion is better.
Marsh and Cummins are only young and need to perform in first class cricket. Marsh took a 6 for which was good but he has got to keep performing and hopefully make some runs as well. Cummins has only played a few games of first class cricket and averages in the 40 with the ball. Has undoubtable talent though.
Warner is not a test quality batsman and will be found out against top sides. Admitedly he does play straighter then people think but one score is not the be all or end all. Tom Cooper made 98 and 200* in the same game and he is a journeyman. Look what Katich had to do get back in the test side after the 05 ashes, he had to set a record for most shield runs in a season to be recalled and flourished. It is a honor to play test cricket for Australia and it is not like AFL were you blood players. Look what happened to Smith and presently to Hughes as they have been exposed. Shaun Marsh had 10 years first class cricket were in only the last 2 or 3 years he made serious runs but it has all been a positive experience cause he knows his game and the mental application it takes to make runs. Same can be said about Jonathan Trott from England who was not plucked as a young fella rather made lots of first class runs and was just recently named the best player in the world. Mike Hussey played lots of first class cricket as well. I'm sure you can list lots of prodigy's who debuted early, i.e Ricky Ponting, Sachin Tendulkar, except they all would have dominated first class cricket and are superior players to those you just listed.