I noticed that too. And, of course, since neither of us work for BMWAG, we can only speculate. But my theory is that the E65 is NOT the original 7-series replacement for the E38. I suspect an earlier E number (lower than 63) was the original 7-series replacement that got scrapped and the "new" replacement (the E65) got the priority treatment to make up for a late start as it needed to be the next main product line replacement. Everything else got back-burnered until it was complete.
I'll dig around and see if I can find the references I recall reading about an aborted 7-series replacement and the resulting E65.
I'll dig around and see if I can find the references I recall reading about an aborted 7-series replacement and the resulting E65.