You can't read too much into prospect visits beyond a sincere level of interest, but the Falcons bringing in Phillip Dorsett and Ty Montgomery for workouts tells a story that I suspect we'll see confirmed on draft day.
What's that story, you ask? The Falcons have needed a receiver for multiple years now, and they're finally going to spend a draft pick on one in 2015. This is a team that has Julio Jones as their top receiver, which makes an enormous difference, but they're working with aging options in Roddy White and Devin Hester, plus a reclamation project in Leonard Hankerson. Julio obviously has the size and speed to strike fear into the hearts of defenses, but the Falcons are decidedly without speedy receiving options outside of him, and White and Hester are both on the wrong side of 30.
Dorsett fixes that issue, as speed is his major asset. He's had some issues with drops in his college career, but is largely a sure-handed receiver, and he offers legitimate special teams value as a returner. Chances are he'd play most of his snaps in the slot for Atlanta, and take over as the team's returner once Hester moves on. Assuming you're still pretty happy with Jones and White and think Hankerson can contribute, you can't ask for a much better fit for this offense in 2015 and beyond.
Their second workout was with Ty Montgomery, and you'll find a pretty good scouting report on him below. Suffice to say he's also an intriguing option with legitimate speed.
The question is when the Falcons will be willing to sink a draft pick in early enough to grab someone like Dorsett or Montgomery, as both could go in the second or third rounds. If the team manages to address their pass rushing woes with their first pick, I'd definitely support a move to give the Falcons more speed, ability and youth at wide receiver.