Sometime back when "Batman" was just a comic book character they used red brass conduit for the raceway to underwater lights. That conduit could also be used to tie other elements of the equipotential grid together. I suppose if someone actually used brass conduit for a pool light they could tie the deck grid to the deck box raceway.
There is an interesting interpretation of the deck grid floating around in Florida that says the deck grid must be continuous into the pool shell grid ie:bonded every 12". This came from Don Jhonson CMP17 at a Miami road show.
This was the example Fl IAEI had Large image
Florida is still struggling with whether they will take 6 over #6 mesh as the grid for the concrete deck.
They are also wondering what you do about "packaged" spas. Is that permanent and needing a bonded deck? The workaround everyone seems to like is an elevated wood/composite deck around the spa. It still is troubling to most if they just drop one on the lanai/patio.