Perhaps UberHawk you should do a bit of research yourself before you stereotype folks based on race or the position they happen to play. I'm feeling generous so I've included results from the past few yrs at the Drake Relays just to save a bit of time. A generally accepted formula used by several noteable authors would equate to a 10.83s time at +0.0 wind which could further be estimated at roughly a 4.4s - 4.5s 40yd split depending on body type for Zack. That my friend would have been fast enough to beat or compete with the following 2013 NFL Safety drafts based purely on their NFL combine scores: Micah Hyde-IA (4.56), TJ McDonald-USC (4.59), Rob Lester-AL (4.66), Zeke Motta-ND (4.83) just to name a few. Heck I will even provide a link should you want to compare against a few more:
2013 NFL Combine results: Safety 40-yrd dash times
Year Athlete Time Wind
2013 - Zack Skibinski 11.41 -5.6
2012 - James Harrington 10.61 0.7
2011 - James Harrington 10.84 -2.7
2010 - James Harrington 11.01 -2.5
2009 - Patrick Lewis 11.18 0.0
2008 - Jarred Herring 10.69 2.4
2007 - Jarred Herring 10.91 0.3