For me the problem is that "listed" weights are so often fictional. They tend to be exaggerated for smaller guys and minimized for big guys (generally). We know for a fact that that Chad Johnson played at 170 lbs (by his own admission). His "listed" weight was 188 lbs. That's almost a 20 lb difference. Back when I was more involved in this stuff, that was not unusual (listed weights being 20 lbs off, up or down, from actual weights). In fact, I would say it was the norm. So creating some arbitrary narrative that 180 lbs is okay but 170 lbs is too light makes no sense. What makes sense to me is looking at film. And by every measure we see on film, Smith is one of the best players ever.