ah, correct. i wasn't clear about the frequency aspect.Perhaps your more general question is about their training frequency on an ongoing basis.
without the higher frequency at a training center it's more difficult to maintain your game over the long term. so far none of them have re-established their old level of play. plus, they all left at the top of their game while at peak age.All of the players talk about how much less exhausting training with their pro teams is.
re. lee hyun-il's comeback... though he knocked off the occasional top 10 player during his return i never felt he was a threat to win a superseries or sustain a top 10 ranking. but, when i saw him in a gp gold i considered him one of the favorites to win it. he was at the age where over training would yield diminishing returns. lin dan is currently struggling with that dilemma.