We are through five weeks of the regular season, and the San Francisco 49ers are fourth in the NFL in snap count percentage for rookies. The first-year players were always going to be relied on to make instant contributions. Each of them has, in their own way, been a big part of why the 49ers sit atop the NFC West. Let’s get into the rookie report card.

Mykel Williams

Mykel Williams received Arik Armstead comps for the exact way that he’s played through five weeks. Williams doesn’t have a sack, has one game where he had more than one pressure, but has been the force the 49ers need along the defensive line.

Per Sports Info Solutions, the rushing EPA per 60 plays is -13 with Williams on the field compared to -2 with him off. That’s a drastic difference, and a sign that Mykel’s best footba

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