I see one of two options, Lions trade the 6th pick for Tennessee's 11th pick and Simmons plus some late round filler on either side, or the Lions trade 18 for Simmons and maybe some other late round pick. Chicago went 1 to 9 and got two 1sts plus DJ Moore and other picks. Simmons is more valuable than Moore but you also aren't getting an additional 1st rounder so it seems fair.