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I think I know what they meant. When you first see the King, the player is tasked with going east to find Mercury but you can skip that whole section without even going there once by just going into the underground part of Glittergold Town past where Melody stops you your first time there and past that you can just trigger the "shard" fight with your whole party. I was confused but loaded my save and did the east part to find Mercury first and then understood what was going on. I suggest adding something to stop the player from accessing that underground part after the  Melody interaction until after doing the east area.

EDIT: Also, the fight after breaking out of the the cell was much easier with all party members (which obviously shouldn't haven been there if you do the east section first). Doing the fight correctly (alone) turned into spamming healing items because most of my skills were unusable due to having no weapons equipped for it which shouldn't be the case because the player supposedly had the black dagger because the king couldn't take it but I was unable to use any of the dagger skills in the fight. It was a very tedious fight. Lucky Stab would've been great there. : )