Cloth Covered Two-Wire and NM w/Ground in Same Junction Box

I'm in the middle of a remodel. A wall was removed and the wires through the wall were rerouted through the attic by the contractor. The old, cloth covered two-wire cable was used where ever possible. There is a short stint between two junction boxes where new 14/2 Romex was used. The ground wire in the Romex has nothing to connect to on either end. The inspector said the ground wire must be connected to any other ground and suggested running cable to another branch circuit solely for grounding. Does this sound right? Can someone point me to the NEC requirement for this? Also, I'm very wary of having cable run from on branch circuit to another even if it's only for ground. I'm in San Jose, CA: CEC 2013 (NEC 2011) Thanks!