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.