I don't like the coin personally, full of misunderstood traders thinking banks will use the public tokens, they use a private supply on a private network, I don't see a use for it as a token, it's also highly centralised.
Private supply of WHAT?
Private network? What private network?
xCurrent is the products banks use for transfers, xCurrent does not use XRP, XRP is what you're buying, it supports fiat transfers which is what the banks are interested in
xRapid is a product they've made for banks so they can liquidate their money in to XRP, no banks are interested in it, it's far too volatile, they would rather stick with bonds.
Tests have been done with xRapid using a private supply/non circulating supply, banks are not buying the public XRP to even test it.
All of the banking hype you hear about Ripple is from banks using xCurrent for fiat transfers.