Marshall is great for the Giants. Our best counter would be to build the trenches. DL and OL. Nothing helps DBs like a great DL. So I say resign Mo to an incentive-laden contract (3 yr) bring in DWare and Cordarelle (or Britt). Then add a DE, CB, S, OT in the first 4 rounds of the draft, and a couple of WR flyers late. We need to trust in our Scout evaluations and McClay. Fingers crossed.
I'd say we need to bring in a free agent safety, too, whether it's bringing back one of our own or getting an outside FA.
I'm not worried about our offense. If we get a receiver equivalent or better than Williams, we should be good there even though our offense did struggle against the Giants' defense.
What will determine if we can truly contend for a Super Bowl will be our defense. I'd like to see us keep at least two of our secondary free agents, sign Ware, trade for Sheldon Richardson (if the price is right), draft a DE in the first round and draft a corner in the second (or vice versa depending on who is available, although DE needs to be the priority).