I employ two runners exactly the way you envisioned and I've found NoS to be marginally useful.
My 'thrower' has blodge, pass, accurate, and strong arm.
My 'catcher' has blodge, NoS, catch, and side step (picked up after having a couple of blitzers die and needed to use as a faux blitzer, though sure hands may have been better as I use this guy on defense).
As PaloLV states, blitzing a dump-off player does not apply the -1 modifier to the dump off pass, meaning a dark elf runner still does it on a 2+. However trying to catch a ball in traffic makes NoS still useful. That being said, it is kinda backwards as you probably want to avoid being in traffic in the first place. I like having NoS but I wouldn't take it first again on my next one; probably blodge and catch/sure hands first next time. Then maybe go with NoS.
About the agi6 runner though - definitely dodge first, then block. Afterwards you could go with sure hands or leap if he makes it to legend.