Third Nacelle wrote:
But Data's head was left there in 1893, 340 years before the timeline split. If his head is beneath San Francisco the day before the Kelvin was destroyed, why wouldn't it be there the day after?
The point is that, unless and until we find out in JJ-canon, we don't actually know if the head is "really" there in the JJ-universe.
For all we know, maybe in the JJ-universe the head isn't there the day before the Kelvin
arrives either, such as for the reason that beamMe
gave. TPTB aren't obligated to follow anyone's rules of the way things operate, except their own.
Maybe the head's there; maybe it isn't.