Does not really matter at all as we have tons of potential penalty takers in the team. Griezmann is still a very good penalty taker. In any case I don't recall our last penalty shoot-out in an official game on top of my head.
By any means not even Malmierda's retarded "tactics" or lack thereof, or the fact that much of the spine of the team consists of past it old boys, is going to prevent Griezmann from succeeding as long as he ends up playing next to/with Messi more often than not.
Similarly with De Jong. If he and Arthur develop a chemistry, no matter the third past it option (Busquets, Rakitic or Vidal) in the midfield, the two of them will succeed. At least individually. Collectively is a different ball game altogether with Malmierda at the helm, the current useless, clueless and poisonous board and a team with tons of players that peaked ages ago.