There has been. Here's is the Carlos Martinez discussion, by the bullet-points:
-- Carlos Martinez will come to spring training as a starter.
-- The Cardinals want Carlos Martinez thinking about starting, preparing to be a starter, and ready to embrace the regimen of being a starter, and that includes a commitment to the between-start program and the expectation that he'll be there for the team, on time, on the days he starts. They want him to do more than take on the role of starter .. they want him to accept the responsibility of it.
-- They know he can close.
-- If the Cardinals are lucky enough to have six starters emerge ready, raring to go, and one of those six is not Carlos Martinez (yeah, good luck with that), and they need a starter, they will look at Carlos Martinez at closer.
-- If Carlos Martinez does not commit to everything that goes into starting and the Cardinals have an alternative, they will shift him to the bullpen where the role may be a better fit, and that could be closer.
The addition of a starter really only influences one element in the above list. It does give the Cardinals greater depth. But the Cardinals realize they are a better team getting 180 innings from Carlos Martinez than they are getting 70 innings from him. They can make a closer elsewhere. They cannot make a starter like him at his best.