In as much as those "secondary observers" are actual observers of their own, what is needed for everything to be consistent is that they too, in THEIR view of reality, see the first observer as consistent with that.
Do ALL humans communicate ALL of their detailed existence to ALL humans? How could they even communicate this without an instantaneous speed-of-light? The state of everyone's perspective would always be on a lag at best, thus not ALL including the instantaneous present (otherwise stated as "
the present never exists" because its always gone instantly before we can perceive/decohere it as mutual information).
In other words, is it plausible that everyone on earth could know (or at least received communication about) everything about everyone on earth.
Obviously it is a rhetorical question and it is intended to point to an inconsistency in your holistic conceptualization (although of course many of the points you've made are correct).
The following may be interesting:
http://esr.ibiblio.org/?p=690