An interesting hypothesis! Hmm...was it really that easy?-Mark
The workers in the assembly department probably didn't know and/or control the product production schedules/quotas.
Imagine sitting on the line with bare wrapped, drilled and painted shells being dropped off. How would you know if a shell drilled with 8 lugs and the same strainer/butt pattern was to be a Powertone or Tower? The difference was either Flat or Gloss paint. If it had Flat paint, you'd install a Sta-tite/standard butt. If it had Gloss paint, you'd install the Swivomatic style.
It would be nice to know how the assembly line ran from start to finish. For example, when was the tag installed. That would've also helped the assembler know how to build the drum.
Of course, this is all speculation. ;)
-Tim