Versatile Detroit Lions rookie embracing switch to RB, new NFL kickoff rules

ALLEN PARK -- Transitioning from the college game to the NFL isn't an easy task, no matter the situation, player or position. But Sione Vaki is embracing the challenge of making the switch from safety to running back, not to mention learning the new NFL kickoff rules in his early days. The fourth-round pick for the Detroit Lions was listed on the roster as a running back, no surprise there. And he was impossible to miss flying down the field with the new-look kickoff rules on the first day of rookie minicamp. The Lions are leaving the door open for safety reps , Vaki's primary position at Utah. But he and the team will focus on his move to running back and as someone expected to complete for