D was tremendous. Offense looked great in second half, besides garbage time of course. The first half they were good but missed on a few third downs that could have extended drives and garnered more points. Even Shanahan said he wasn't happy with 21 points in first half. When this team is firing on all cylinders they will be tough to beat. They have one achilleas heel though. Mobile QBs can give them trouble because they can't use their LBs the way they did against Cowboys as one needs to spy QB at all times. Allen, Mahomes and Hurts are the 49ers biggest threats.