the "other nine" conversation seems to bubble up to the surface every decade or so....it'll never happen as Gibson Island is not about the golf, so much as it's about sailing, fishing, etc.
that being said, it is very cool to see the drawings of the entire course in the pro shop and imagine waht could have been....if i recall correctly, the finishing holes were to play right along the shores of the Bay and finish right where the pool/clubhouse facilities are presently situated.