How is time duplication accomplished?

You take any one person and take this moment and you have one person.

Then you go back before you took that person and you have two persons

Then you go back before you took that person and you have three persons.

It is also possible to take all three of these persons who are the same person in a different time and

duplicate these three persons into 6 or 9 or 12 persons.

So, now you have 12 persons. But, you might say wouldn't doing this prevent all this in a cyclical manner?

Not necessarily.

However, if you wanted to go back to one or two or 3 persons I'm not sure how you would effectively accomplish this in any humane way.

Basically, it is likely that even Purple Delta 7 multiplies into 1000s of exact duplicates in this way too and then sends them all to different time space periods and they stay there until called for emergencies.

So, when they are called the come (some times all of them) and take out whatever the problem was that might have taken out any one of them and anyone who harmed anyone of these copies of Purple are no more instantly.

This is a pretty effective battle strategy as long as you have communications between all times and spaces any of them are in.