FLOWERY BRANCH – The Atlanta Falcons have been busy over the last several weeks, adding players to an overhauled defense. Jeff Ulbrich’s unit will look to build on a solid first season, and year two is sure to bring some changes.  Last weekend’s NFL Draft might have spurred one of those updates to this defense, and JD Bertrand will find himself on the wrong side of those additions.  Ian Cunningham went heavy on defense over the weekend, adding four new contributors on that side of the ball – two of whom are linebackers. For what had already been one of the more overturned positions on the field, the draft only brought more of that upheaval.  And Ulbrich wants his linebackers built in a certain way. He wants bigger players who flash more athleticism. At 6-foot-1 and 230 pounds, Bertrand does not boast either of those things.…