Seven Players the Steelers Must Attempt to Sign as UDFAs

Now, the post-mortem on the draft has begun. Part of that process is who will the Steelers contact to bring in as undrafted FAs. With that in mind, here's a list of 7 UDFAs the Steelers should be earmarking to sign to a free agent deal:
Marcus Davis, WR, Virginia Tech
Luke Marquardt, OT, Azusa Pacific
Cierre Wood, RB, Notre Dame
Chase Thomas, OLB, Stanford
Corey Broomfield, CB, Mississippi State
Melvin White, CB, Louisiana-Lafayette
Robert Lester, FS, Alabama
This would round out the roster at the 80 player maximum and would add players at positions that appear to need more competition. buckeyehoppy's mock draft had a list of UDFAs the Steelers would have been able to pursue. Some of them were drafted. Others now don't necessarily fill any necessary purpose to the Steelers. The one hold over from that list to this was the CB Broomfield.