What are the Cab Driver and Jack trying to accomplish?

My question is exactly what the title says. What are the Cab Driver and Jack trying to accomplish over the course of the game? It is of course heavily implied that the cab driver is Caine, and the Anarch ending shows us that Jack rigged the Sarcophagus to blow while also heavily implying that the Cabbie was involved somehow, or at the very least, aware of and observing how things unfolded.

If he isn't directly involved in that plot, then the answer is obvious, Jack wanted to cause some trouble and potentially kill a few Camarilla big boys, but what is Caine's stake in this? Why is he interested, and why are him and Jack so chummy?

Another thing gnawing at me is why, if the cab driver is indeed Caine, did he take such an interest in you the player? I mean, he personally spent the game acting as our chauffeur, and of course we have his long talk at the end, the advice he gives us. What makes us so special that the dark father himself takes an interest?