The thing is that the a league is a good league and not miles away from the premier league, at that level the difference between a premier league player and an a league player comes down to small percentages. Half a step quicker, a fraction of a second faster at making a decision, releasing a pass sightly earlier, etc.
Compare that to the number of struggling pros or jouneymen from lower levels who have come the other way and done very well in the A League . Ifill probably top of that list
Jedinak the only one I can think of. And he went via Turkey and signed for Palace when they were in the championship.