Dont be fooled by some of these guys that look to be very out of shape. There are many guys that look overweight but are very fast and have stamina. Look at some MMA heavyweight who have big ass beer guts but could kick you in the head. I do hear what you are saying in many cases. Alot of guys tend to get so caught up in the "knife fighter" mentality that they are not very good "fighters" to begin with. You do have to train with the empty hand to be effective. You cant train with a knife or stick and then just magically translate it to empty hand when the need arises.