A part the fact that Wilcock seems to me to have a huge ego, he have no real knowledge of numerology or gematria.
The number 333 is not a positive one and means "darkness" .
http://billheidrick.com/works/hgm3/hg0330.htm
Additionally is the number of Choronzon the demon of the Abyss.
http://en.wikipedia.org/wiki/Choronzon
In fact 333 indicates the darkness of the Abyss where this “demon” lives inn.
a gematric formula give also the solution for this
DSDR SE = 333
this is a Notarikon for "desire of (high) Self
".
The Formula explain that to pass to the state of Kether you need to loose your own ego.
So maybe this is the real message of the syncronicity for David.