Why do people think Tyson has a chance in the UFC??

There are kickboxers that would knock him out. He ducks too much, its good for boxing, but if you duck in the UFC its time to eat a knee or foot. And a knee is way more brutal than any uppercut. Also Tyson would get taken down at will even my a small dude like Matt Hughes. Does any one believe Tyson could even beat 170 lb Matt Hughes?