Mike, I replaced my front splits last weekend, and the wiring for the tweeters doesn't seem to come from the drivers in the doors. There are only two wires heading to the drivers in the door on each side, and no wires leading away from them. When I looked at the tweeters and replaced them, they had a separate set of wires leading to them, but not sure where they came from, maybe it was directly from the head unit. They seemed to have tiny crossovers attached to them directly.
Tracing the wires would have been a hugely time-consuming process - taking the A-pillar cover off is a task and a half, because it's all one piece going to the B- and C-pillars too, so I just didn't bother.