Miami Dolphins coaches Mike McDaniel and Anthony Weaver express confidence in an inexperienced secondary that has onlookers antsy.

Miami Dolphins cornerback Jack Jones knows exactly how it looked. His brutal day of practice against the Detroit Lions last week was all over social media with highlights of wide receiver Amon-Ra St. Brown leaving Jones in the dust.

Miami Dolphins rookie cornerback Jason Marshall Jr. has been putting together a strong training camp and preseason so far. But it's his recent emergence in the slot that has coaches and teammates buzzing this week.

Miami Dolphins defensive coordinator Anthony Weaver praised the cornerbacks and emphasized the importance of the pass rush.

Rookie Jason Marshall Jr. is building a case for a role in the Miami Dolphins’ cornerback rotation.  Just one preseason game remains, but Miami’s cornerback dep

Effort cannot be taught. Hustle cannot be taught. Grant has it and the Dolphins couldn't be more thrilled. "I think effort ultimately is a choice, right?" Dolphins defensive coordinator Anthony Weaver said as Miami prepared for its third week of preseason.

Dolphins rookie Jason Marshall Jr. continues to show growth playing in the slot, a new role for him. He played very little slot at UF. Marshall handled that role in the preseason game against Detroit and "what stood out the most was that was his first time doing it, and he played it at such a high level," Fitzpatrick said.

Miami Dolphins' secondary shakeup: Anthony Weaver's bold confidence and Jason Marshall's surprising role shift.