SANTA CLARA -- The 49ers are on the verge of surpassing 2,000 rushing yards for the season, a milestone Chip Kelly's Philadelphia Eagles hit only once in his three seasons and about 500 yards more than San Francisco gained on the ground last year.
So why hasn't Kelly's offense had anywhere near the success he had in Philadelphia?
Each of those Eagles teams finished with more than 4,000 passing yards. His 2016 offense will be hard-pressed to reach even 3,000 this season and more likely will be the only NFL team to fall short of that mark; by comparison, former offensive coordinator Geep Chryst's unit finished with 3,316 passing yards last season.