If an aircraft near a departure holding point tells me he's not ready for departure, I'd like to know the reason: If it's for the cabin then I can reasonably expect it to be ready in the next few minutes, if it's for final figures then I might consider moving it out the way to another holding point to enable a/c behind to get to the runway. Likewise for a technical issue or possible bag discrenpancy, also in those cases I might warn Ground that the aircraft might be returning to the terminal.