Remember Johan Santana? Phil Hughes? Matt Moore? (now injured), Price didn't have that much BP time, but he pitched in the BP for Tampa's 2008 playoff drive, Adam Wainwright, Fausto Carmona (before he became Roberto Hernandez and sucked) along with, of course, Sale and Max Scherzer, who was also used in relief for about half his rookie appearances.
Even if you don't use the "rotation headliner" tag, a bunch of succesful starting pitchers pitched out of the BP before moving to the rotation with no ill effects, which was the point of the post.