Lazaro Renoso wrestled for Carson Newman and never won a DII title, but beat John Smith at the Olympics and ended up placing 3rd.
Tom Erickson wrestled Juco Another wrestler from Canada wrestled NAIA and won an olympic title. Jody Strittmatter wrestled DII prior to wrestling at Iowa. Ryan Lewis wrestled for DII prior to wrestling at Minnesota. TJ Williams wrestled Juco.
There are plenty of great wrestlers out there that didn't start out in Division I.