The Mike Vrabel era began with a bang this spring, when the New England Patriots made several significant investments in NFL free agency.

Rob Gronkowski expects more fireworks this fall.

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The former Patriots tight end spoke with NBC Sports Boston's Kayla Burton on Friday at Boston College High School, where he helped unveil the school's new state-of-the-art weight room. And while Gronkowski liked New England's offseason additions -- which included wide receivers Stefon Diggs and Mack Hollins, defensive tackle Milton Williams and BC alum Harold Landry, among several others -- he still isn't sold on one particular position group .

"I like what they're doing, big time," Gronkowski told Burton. "I feel like they fi

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