The idea we owe them anything at all is one that could be challenged should an no deal scenario arrive. Nothing is set in stone yet, I'll quote Barnier again for you shall I, you seem to have missed or conveniently ignored it last time, 'nothing is agreed until everything is agreed'.
Do you think a no deal scenario would occur and we just stump up the cash, this is exactly what DR has said won't happen, it's common sense.
Barnier and his pals, thought they were being clever when they dicatated the order of business, thinking that they'd get what they wanted first and that we'd just cave in on the rest, hasn't happened yet has it and they're panicking a bit.