One of my brothers trains almost exclusively in boxing he is technically sound and is the same wieght and height as me his stance leaves him open for sweeps on the inside his footwork is geared towards avoiding punches which doesn't get him out of the way of my leg kicks and his head movement which slips punches well brings his head down into my kicks and knees. and once on the ground if all your going to do is hold on for dear life which i can brake your grip pass your guard and if you think mma fighters have no chin then you haven't been elbowed with your head against the mat or you give me your back becouse you think your going to stand up but you get choked out instead.