I had a look at this theory tonight.
2010 season ( 2yo only )
Predergast
13 individual winners, 7 of which won first out, 4 more won on their second start
Weld
16 individual winners, 4 won first time out, 8 more in their second run
Bolger
13 individual winners, 3 won first time out, 4 more on their second start
O'Brien
42 individual winners, 7 won first time out, 17 more on their second start
Percentage of individual winners to win first time out,
Predergast 54 per cent
Weld 25 per cent
Bolger 23 per cent
O'Brien 17 per cent
Percentage of individual winners to have won on either first or second run,
Prendergast 85 per cent
Weld 75 per cent
O'Brien 57 per cent
Bolger 54 per cent
Prendergast would certainly seem to have his juveniles fitter first time out than the others.