Raheem Mostert elects for season-ending surgery that will hopefully bring him back to 100% next season. 49ers add for Lions running back Kerryon Johnson to the practice squad. According to reports, John Lynch has spoken to teams about trading for a cornerback, including Cameron Dantzler of the Vikings. Who were the best/worst performers on defense in Week 1? Learn more about your ad choices. Visit podcastchoices.com/adchoices