Thanks very much for the sustained clarification here. This is quality discussion.
To address your points in order:
1) The XBridge protocol is not part of XC and does not run inside XC.
It's open source and will be integrated into all coins on the Blocknet.
It's required for every Blocknet transaction, not just those involving XC.
In contrast, BTCD and NXT are core technologies in the Supernet, and pretty much nothing can be done without them.
As is the SAME for XBridge. Will XBridge work without your core coins? Nope.
I didn't know XBridge is opensource? Whats the link for it?
It's not the same with the XBridge protocol. The whole point is that the XBridge protocol does not run on any particular coin.
Every coin in the Blocknet is a "core" coin, or at least has the same status.
No coin can be part of the Blocknet without having an XBridge.
From the above, the XBridge is not the same as BTCD and NXT. It's not even a coin!
The XBridge protocol hasn't been created yet. I hear part of it has been written though. If I get a Github repo from the team, I'll publish it widely.