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I sincerely doubt that they were ever released as Pick-a-Brick. My guess is that there have been equal numbers of torsos and legs at one point or another.
The numbers just don't support your guess. Do a quick search on bricklink for the Zam Wesell torso, over the last 6 months 1,635 "new" torsos have been sold and there are currently 632 "new" torsos in shop inventories. There have been NO sales of "new" copies of the printed legs for that figure in the last 6 months and there are only 30 "new" copies of the printed legs in store inventories. Also, the printed torso without arms/hands for Zam Wesell has sold 336 "new" copies in the last 6 months and there are currently 829 "new" copies in store inventories.
Add all that up and it tells you that 3,432 "new" Zam Wesell torsos have either sold in the last 6 months or are currently in store inventories versus 30 "new" printed legs in the same time frame. Do you want to believe that people have been hording 3,400 printed legs over that time period? And you need to remember this figure only appeared in one set, a $30 set, that was released about 8 years ago. I was guessing at the pick-a-brick link but I can't believe that people have been popping open almost 3,500 copies of set 7133 and selling off the Zam torso while hiding the legs to the figure. The Zam head is almost as available with about 3,000 "new" copies sold or in inventories over the last 6 months.
More on topic the Tusken Raider torso has had 1,728 "new" copies sold or in inventories in the last 6 months. The armless torsos add another 110 "new" copies. There have been just under 4,000 copies of "new" tusken heads sold or in inventories in the last 6 months. Where as there have only been 84 "new" copies of the corresponding leg assemblies that came with the tusken raiders. Bare in mind those heads/torsos/leg assemblies only came in set 7113, it was a $10 set if I remember correctly, and it also was released 8 years ago.
The hard part in figuring out how these items made it to market is that they were at their peak of flooding the market a good number of years back. Unless someone from bricklink who sold a large number of the items came forward and told us how they got them we can't pin them down any more to a specific store / country. I picked up 20 copies of the tusken raider torso WITH tusken head from a bricklink seller for $0.90 USD each maybe 3-4 years ago and the seller had tons more. I only bought 20 copies because I knew at the time it was hard to come across the correct legs for that figure. Now the first seller who has the torso alone in bulk wants $3.75 each torso so you can see things have changed and the numbers of available parts, while still great, are much less than they previously were.
-David