nologic, you've already asked this question at the 'escorts' post on this forum
http://www.flyertalk.com/forum/Forum85/HTML/002266.html
Basically if you're at an illegal connection, CX is under no obligation to 'escort' you. But if you're within a legal connection time, and you're delayed for some reason, CX *might* ask JL for assistance.
Bear in mind that CX is in a totally different terminal to JL and that CX must send over one person to *meet you*. You can *always* call CX res and ask this, because what we may tell you may not be what CX will do. Then what are you going to do? Blame us?
I know of very few instances that CX has not even met me for a legal connection and the flight has been delayed! And we're talking about HKG!