Adding Fuller isn't a bad thing. It just adds one more option to the list. Let's face it, we're going to go into this year with 7 receivers, and two of them will be rookies, and the third will be Amari Rodgers. The top 4, to start the season, is what they're aiming for, I'd guess. An array of targets where there once was one, in Adams.
New arrivals, via the draft, aren't going to be ready to go full speed, and effectively, when the season starts.
If they do bring Fuller in, I think it's an insurance policy that they can have 4 guys ready to lock and load.