If he improves enough to prove to the coaching staff he can be a franchise QB, then it would be smarter to use the picks to surround Rosen to grow to be a better QB.
On the other hand if he fails to impress the coaches or even does well, but still leaves some doubt if he could be the man to take up the QB position for the next 10+ years, then Miami has to use one of the picks to bring in one of the top QBs to compete next year against an already behind theb8 ball Rosen.
Rosen still has to 12 games to prove himself, and that does not exactly mean he needs to win every games, but he does have to show he is taking this inferior team, and still getting the offense to play well against anyone.