Although more than 78 professionals made the cut at The Barclays 2016, there will not be any players who get MDF'd on Saturday after Round 3.
During normal PGA Tour events, a secondary cut is made after 54 holes when 78 or more professionals make the weekend field, reducing the Sunday field to the number nearest 70 as possible. This is done to have fewer groups and players on the course, making sure play can finish at a reasonable time. Those players subject to the secondary cut are said to have been MDF'd, or Made the Cut, Didn't Finish. They earn 1 FedEx Cup point in regular PGA Tour events.
However, during the FedEx Cup playoffs, the PGA Tour does not have a secondary cut for The Barclays or the Deutsche Bank Championship, the two tournaments in the four-event series which have 36-hole cuts. This is done because players' seasons could end prematurely in the playoffs if they're not able to play out the full final 36 holes with a chance to improve their standing and potentially earn enough FedEx Cup points to move on to the next stage of the playoffs.