Beachcomber, I can try. I've been following the science of this for some time, but forgive me if I try to make it more 'visual' in the way I describe it. Latest set of observations is that when we're born, there's a blueprint for how the brain is supposed to be wired in. Equal wiring between the social bits, technical bits, eyes, ears, skin, etc.
The brain has its own 'engineering/rewiring crew' that does it, they've discovered to their astonishment - somehow there's cells that move bits of the brain wiring around.
In autism, for some reason, the blueprint changes from one where there's equal wiring to everything, to one where there's extreme specialisation and speed to some bits, and some bits get no wiring at all/the equivalent of communicating with a yoghurt pot and string.
Eventually we overcome most of it by using other wiring to do the same job, so we gradually learn skills that aren't natural to us. It's at a cost, though, because those wires aren't designed for the big workloads and they get very worn out very fast (a bit like getting an electrical shock, in a way), hence the meltdowns/shutdowns.
But it explains why those with an ASD often (certainly not always) have a 'splinter talent' or extreme sensory sensitivities. Those are the bits that got the superfast broadband wiring on the new design.
Simon Baron-Cohen and his team are doing a lot of work on this type of thing at the moment, and has shown that there are often strong links to mathematical and scientific excellence in families with autism. If the rewiring goes well, you have a maths genius etc. A bit too much rewiring, and it seems you have autism.
So, what's causing the brain blueprint to change? As yet, no-one has a proper scientific clue. But my theory is that if there's a leaky gut, maybe there's also a leaky membrane to the brain, and maybe the rewiring crew in the brain is spending their time bailing out the overflow instead of building all the wiring in the right place.
Er, does that help?