This would delay the KO round for a short moment, perhaps adding a little more excitement to the tournament. Also, it gives a little moment to each group to cheer once more for their team, which makes it more clear to the other groups who is who.
Something like this:
... group0 (The Group name)
Total food eaten .... 120
Total enemies killed .... 5
Total time needed .... 30:05 seconds
....
Now for the KO round.