Spartan R41:

I have never heard/read of one. Name one for me.

They don't really exist its a technological impossible for us right now, its all theory i even  did a a research project on them for my computer programming class, but they may be possible for the forerunner. And besides we don't know if Spark was active the entire time he may be activated when the flood was released or when the ring detected presence on the ring.