The New England Patriots could use a serious upgrade at offensive tackle, but ESPN’s Mel Kiper Jr. has them addressing the defensive backfield in his recent 2023 NFL mock draft. With the No. 14 overall pick, Kiper has the Patriots selecting Illinois cornerback Devon Witherspoon. It’s a solid pick if the Patriots prioritize fortifying their defensive backfield over the offensive line. Witherspoon made the First-Team All-Big Ten in the 2022 season after finishing with 41 tackles, three interceptions and 14 pass deflections. The Patriots might need some help at cornerback if they lose Jonathan Jones in free agency. There are…