Imagine a qualifier after playing two matches the same day,one in the morning and another at night, to qualify and in less than 8 hours the next day join the main draw to play in round 1 and,horrors,meet Lin Dan,Lee CW, or Chen Long! This is the norm in every SS tournament, that's why these players have to be supreme athletes, and that's also why ,I believe, all the top players are not too bothered whether their opponents enjoyed a rest day or not - just avoid injury and be in good form,hopefully.