Also, since chuck trained kempo and kick boxing, this wouldn't be a sow choy... this would be a boxing punch called an overhand right. swinging punches are not unique to clf.
http://www.youtube.com/watch?v=psxS88aeBYM
http://www.youtube.com/watch?v=h3wgEBn3u4U&NR=1
http://www.youtube.com/watch?v=KIf0A...eature=related
chuck has two versions of it. the typically seen boxing overhand, and the really wide one which you are comparing to a sow choy. this clip from a video game shows the boxing one....I know it's a game, but since it was a one punch KO, you see the punch immediately:
http://www.youtube.com/watch?v=5rA1b...eature=related
in this clip, you see him throw both punches several times. pay attention at 2:25 and to the replay at 2:34
http://www.youtube.com/watch?v=-CFrPoLg2vo