Anon 870,
Size is a factor, but you can't deny that Athleticism is the major reason why US players are more successful.
Look at Kemba Walker, Jimmer Fredette, Kyrie Irving, Kalin Lucas, Nolan Smith---All those guys are 6-2 or under..All have had successful NCAA careers..Why?
Because of their speed and agility, not because of their size.
Look at the NBA..Ty Lawson is 5"11, Rajon Rondo is 6"1, Jameer Nelson is 6"0, JJ Barea is 6"0, Nate Robinson is 5"9, Chris Paul is 6"0, Raymond Felton is 5"11, Mo Williams is 6"1.
All those guys have been able to stay in the league and be successful players (Guys like Rondo, Paul have become superstars in fact)
And they are all quick guards with an exceptionally quick first step. Reason why Mills (at just 6 foot) was able to make it to the league and stay there--he had great speed.
Aussie basketball players have had the height, so to say that height is the defining difference between US and Aus basketball is ridicolous.
Newley was a great height for a 3 man/swingman--At 6"7 he could have made a great 3 man at the NBA level but he lacked the athleticism to be a good lateral defender.
Ingles at 6"8!! What a great height for a 3 man! But once again he lacked the athleticism to defend.
MacKinnon another player who could have played the 2 spot at 6"6, but lacked the speed needed to be a SG/Swingman
At the end of the day, height is not the issue, athleticism and the lack thereof is.
At the end of the day, "Newley/Ingles didnt make the NBA not because they were too small for the 4 spot, but because they were too slow for the 2/3 spot"
Go to the USA (NCAA college) and their 6"8 players are just as fast as our PG's in the NBL.
If Newley and Ingles possessed their athleticism, I have no doubt they would be in the NBA.