I think that's true. Another theory I have is that: Maybe twins were released years apart in order to make more sales. To explain:
For example let's take the plarail Bill and Ben. The parents may want to buy bill and ben, but in 1999 are only able to find Ben. Then in 2004 Plarail release Bill in the harbor set, but he's twin Ben is also included, so for those who already bought ben separately would now have spent extra money on a duplicate character. Unfortunately this only works for Bill and Ben.
For example let's take the plarail Bill and Ben. The parents may want to buy bill and ben, but in 1999 are only able to find Ben. Then in 2004 Plarail release Bill in the harbor set, but he's twin Ben is also included, so for those who already bought ben separately would now have spent extra money on a duplicate character. Unfortunately this only works for Bill and Ben.
The magic of the GWR
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