A lot of the hockey team sets are only 6 cards. Yes, not really the team, but it's what they put out.
The other teams may or may not exist. Some of these seem to be because the team contracted with the card company, so they have cards. Not all teams did this.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 10/25/2023). I have added a large portion of my inventory to the site, and currently have trading turned off (details are in my profile). I have (finally) unearthed my 2 very large boxes of Star Company minor league sets and they are available (email for details).