No matter how you look at it, having star talent on your roster is almost always a positive. That said, I do believe that you can have "too much" star power. For the Cleveland Browns, adding Jamal Adams would put them in that category, being just one of many reasons why they should stay away from the star safety.
Don't get me wrong, Adams is a very good safety that will without a doubt help whatever team he ends up on. When it comes to the Browns, it just doesn't make sense.