 The biggest running back in this year's class is Boston College's A.J. Dillon. He weighed in at 247 pounds in the combine, and then he went out and ran a 4-5-3-40, giving him an elite weight-adjusted 40 time. Some may compare Dillon to Boston College prospect Andre Williams from a handful of years ago, since they were both big-bodied running backs coming from the same school. The major difference is that Dillon has a complete production profile. He caught over 8% of Boston College's total receptions last year. During Williams' final season, he somehow didn't catch a single pass despite 355 rush attempts. The best comp for Dillon is probably someone like Michael Bush, a beefier back who was able to make an impact in the NFL when he was called upon.