There are rare occasions of king race where you lose the game because you held, as leaking would have resulted in your team's leaks reaching the king later. Suggestion to make holding always better:
The last unit to die in the lane will spawn a ghost. This ghost must reach the waiting area before the gate opens. To not delay waves unnecessarily, create conditions to its existence so it disappears or doesn't even spawn when it's not needed.
Probably too rare event to even consider making this but just a thought.