Chris Carter, NFL and NCAAF analyst, hosts the Locked on Steelers podcast.The Pittsburgh Steelers have addressed several positions in free agency, including cornerback. But all their additions have been about smoothing out the depth chart. Now, they need star power. Mike Tomlin and Kevin Colbert need to make it a priority to either sign Tyrann Mathieu in free agency, or make a major addition to the secondary in the early rounds of the NFL Draft. Cornerbacks like Derek Stingly Jr. and Andrew Booth Jr. could be true game changers in coverage while safeties like Daxton Hill, Jaquan Brisker and Lewis Cine would make a very athletic safety group if combined with the return of Terrell Edmunds and superstar safety Minkah Fitzpatrick.Also, which remaining free agents should the Steelers be looking at? Veteran receivers like Jarvis Landry and running backs like Marlon Mack could be important and cheaper signings.Finally, the latest Mock Draft Monday winner is announced.Follow Chris Carter on Twitter: @CarterCritiques.Theme music is 'Soul Kick' by Ceddy P, and 'Too Easy' by Nerdboy. Both from their label Renaissance Music. Find more from their label here.This show is part of the Locked on Podcast Network. Support Us By Supporting Our Sponsors!Built BarBuilt Bar is a protein bar that tastes like a candy bar. Go to builtbar.com and use promo code “LOCKED15,” and you’ll get 15% off your next order.BetOnline.  BetOnline has you covered this season with more props, odds and lines than ever before. BetOnline – Where The Game Starts! Learn more about your ad choices. Visit podcastchoices.com/adchoices