Deep down, Draco had a sneaking suspicion that Riddle acted on his own. That Yaxley and the other Death Eaters knew nothing of his attack on the wedding. Theo had said the three other men that attacked didn’t have the Always Pure tattoo.  As frustrated as he got with Theo sometimes, the man kept him in check when he needed it most. Because, if left to his own devices and rage, Draco would lash out.  