Breaking down what we can learn from the Vikings’ offensive and defensive snap counts in London. Za’Darius Smith, arguably the Vikings’ most impactful defensive player this season, entered Sunday’s game in London with a questionable designation because of a knee injury. He wound up playing, but the Vikings made it clear that he wasn’t near 100 percent by limiting his role significantly. Smith still managed to make an impact with a first quarter sack that ended a Saints possession, despite appearing to get held on the play. The Vikings will be hoping that he can play more of a full-time…