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As I understand it...
It doesn't matter if the bonding grid becomes energized, as you put it. The purpose of the bonding grid is not to carry energy away from any source, or to de-energize anything, it's to ensure that the energy potential between everything pool is zero. So no matter what stray electricity is present at the pool, if you're in it, and touch the light, or the ladder, or the deck, you don't become the primary conductor, because there is a big, ol' fat copper wire that is in place doing that job. That's where the distinction between bonding and grounding comes into play. A bonding grid does not have to be grounded to do its job. Grounding it does not prevent it from doing its job.
It's like a bird on a wire. He can sit on a high voltage wire, with no ill affects, because there is no energy potential between his two feet, or between him and anything else. There's a huge voltage in the wire relative to earth, but as long as he's not touching the two at the same time, he's fine. The wire isn't grounded, grounding isn't why he's safe. When a pool is properly bonded, it essentially becomes one big, common conductor. It doesn't matter if its grounded or not. No matter where you stand, or what you touch, even two different physical objects, electrically they are not two different objects, they are all one object, so that's why you'd be safe. Nothing to do with being grounded.
The wire coming from the light might not be the bond wire. What makes you think that?
The wire coming from the pump, if connected to the bond lug on the pump, might have been put in place by someone that had no other place to connect it. But that doesn't mean it's part of the bonding grid, it has to be connected to the pool somehow. Or if the wire from the light is the bond wire, then someone decided that the ground bus bar was the easiest way to join them. That's not my understanding of how that's typically done. And I can't say it's right or wrong. Technically that connection is providing the electrical path from the pump to the pool, which is what you're after. But that's only if that wire to the light is attached mechanically and electrically to the retaining ring of the light and/or the niche. And I believe bonding is done with solid copper wire, not stranded.
There's another thread here that describes the code that requires a large conductor like that be connected from the niche to the light's junction box. But that code calls that wire a ground, not a bond. The bond wire is connected elsewhere to the niche and connects to the grid. Does your light have a junction box near the pool? Or do the wires from the light run only to the breaker box? So as described in that other thread, that thick wire is supposed to be connected to the ground bus bar. The wire from the bond lug of the pump is supposed to be connected to the rebar and a wire that runs the perimeter of the pool and is connected to the light niche (all #8 solid copper wire).
As cautioned by another here, this stuff gets complicated fast, and someone on the edge of knowledge about it (me, for sure) has no business trying to decipher pool bonding. It's a big deal and has to be done right, and to code, otherwise the risk of electrical dangers isn't necessarily resolved. I'm not seeing anything in your setup that is wrong, per se, I'm just not convinced it constitutes a proper bonding grid.
But that's why you hired an electrician, who should know all about all of that... I think you're on the right track to question him about all this, and have it be made clear to you that you have a proper grid or not.
