By just about all accounts, the Miami Dolphins' 2013 season was average, which is why they finished an apropos 8-8.
For the purpose of this article, it's important to know that the Dolphins were also pretty average in passing. The team ranked 20th in the league in Adjusted Passing in order to save money. This is part of why the receiver situation is cloudy at best.
To make matters a little worse, there are a few other names hanging around, too, like Tannehill is still failing to get him the ball down the field. Hartline who is having a good camp and a good preseason, then Matthews could be the guy. If Landry, the rookie, continues to expand his role in the offense, then he could take over the slot and have useful fantasy potential sooner rather than later.
All in all, signs point to a useful receiver on Miami's depth chart exists and that it might not necessarily be the obvious guys on the top of the list. It's not a very exciting situation, but keeping an eye out for the player who carves out a steady role could help pay off for you, as none of these guys are, understandably, not being touched in re-draft leagues but might have low-end WR3 upside, especially if Tannehill makes the leap this year.