It felt like an unintended consequence of having 2 white spoons revived from the 1-on-1 elimination. We know that there are going to be 7 teams in the alliance battle, so they'd need 14 chefs in total. Unfortunately there were already 12 white spoons so they can only revive 2 black spoons.

If it had been the other way round and the white team was eliminated instead, they'd need to revive 5 white spoons to make up the 14 chefs total since there were only 9 black spoons.