Not familiar with the details. It it a fault in the way like Notts lost John’s?
There are chokes but I don't know if they are caused by a fault/faults.
The choke at Against All Odds in Aggy could well be the other side of the choke at the end of San Augustin Way in Daren but there's a lot of diving to get to either side. And a lot of sherparing on the Aggy side!
The area at the end of Priory Road in Aggy and the very far end of Daren is probably the best bet for a connection and there are at least 3 places here where the caves get close.
My personal favourite to forge a connection would be from Mother of all Battles choke in Aggy to Do Androids Dream of Electric Sheep choke in Daren. Again, possibly two sides of the same choke and the passages leading up to them are very similar. Would probably need a lot of shoring carried down through Aggy though, via all the crawls in Southern Stream and Priory Road!