From the first article:
despite ISISs dependence on high technology, the group does not yet appear to be using virtual currencies like Bitcoin to avoid engaging with the global financial system
That alone would suggest you are wrong in your original assertion?
But in your defense, from the last article:
The firm says the ISIS group had already received roughly $1,150 worth of bitcoins before the account was shut down by the FBI.
We should ignore all other sources and concentrate on this. its obviously key. :-)
Can you agree that Bitcoin is NOT a source of funding for ISIS? The US dollar is.
Sorry, I didn't read all the articles. I simply copied the first few links from a quick search.
If you really want I could probably find some more accurate news articles.
Anyway, on your last point. Yes, IS ARENT receiving anywhere near as much as we'd expect from BTC however, it's something which they're slowly trying to use at an increased rate.
As it stands currently, it's probably true that most their funding comes from the dollar due to the oil and petrol they've been selling.