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Considering Gardevoir was very favored going into naic I will say it was very smart of Andrew and other players to go with lost box as Gardevoir has always generally had a bad matchup against it. Since Gardevoir decks don't really play jirachi anymore that makes the matchup much more difficult as you are more prone to sableye lost mine plays.
It's actually very tough for the lost box player if the gardevoir plays both the klefki and flutter mane - you can't bundle them, it's much easier to find one, and the flutter mane itself is an insane attacker against the deck. This is why I played both :)