The Atlanta Falcons have at least two major needs along their defensive front, both because they're thin in the middle and lacking impact pass rushers. With a pretty strong market at DT, it makes sense to try to address that position in free agency.
To this point, Atlanta has played the waiting game, and they've looked smart doing so. Besides massive Baltimore run stopper Brandon Williams and end/DT Calais Campbell, who both got massive deals, the top of the market is still there. That includes Dontari Poe, who the team has been linked to, and the likes of Jonathan Hankins and Bennie Logan. If the Falcons want a starting-caliber defensive tackle, they can still get one, and the price should be more reasonable than it would have enjoyed been on Thursday.
This is how the Falcons prefer to do things: Wait, get a deal, and snag a useful player they need. We may have to wait a bit longer, but with Atlanta freeing up cap space and the need still acute, you can expect them to land a defensive tackle before long.