Team has a certain strategy as to how they develop a range; they do 8 to 10 of one combatant, then 8 to 10 of the opposite side, so on and so forth.
It shows collectors a range has legs and it going to be developed, they don't do 10 figures...................then three years later another 10.
Look at how they flushed out the Spanish American War range, well done, the range is now complete, a nice display is now possible, no waiting two or three years for more figures.
I can't see a scenario where they go back and add two figures here, three figures there, it's not their method of operation, at least at this juncture, not to say they can't go back down the road and dabble here and there.
Develop a range, watch it sell, move on to another range, watch that one sell, etc, etc.
Every company does things differently.