Gabi, I don't want to sound harsh, but the background information you gave was pretty much useless to the debate.
What Jay meant is that we would be able to use that currency everywhere. And at first glance, it sounds like we'd need more if the currencies were merged, but we really don't. We have to choose between Stamps or CCPs at that point and it can't be changed..
It doesn't matter that Adopted and Captured Pokemon have different originis. If they can battle in the same Battle Tower (Yes, I know, you can only battle Adopted with Adopted, Captured with Captured), they can certainly have the same currency.
It's easier to keep track of. I'm all for it.