I have a concern, why used? And why the F-16? Yes, it's cheaper, but surely the Jordanians have enough money for more advanced platforms such as Eurofighters or even the Rafales. It strikes me as odd that they would get this particular platform, especially if it's a block 15 as @
kalu_miah is suggesting. It's a really surprising purchase.
The only reason why the Saudis (or any Arab force) would even consider buying the Jf-17 is for the BVR, otherwise, they have more than enough money to buy better fighters. Even with BVR, they'll only consider it if block II or block III rolls out.