Whitlock was a prospect as he was taken in the Rule 5 draft and had never played in MLB before.
Bernardino had played in MLB and was over 30. Unlike Whitlock, he was never "ranked" in the system.
Is Jamie Westbrook considered a Sox prospect? I'd say no. He's just a AAA journeyman. If he makes it to the show and "graduates" he'd show up the same as Bernardino.