Regarding the cash transfer. Israel was ordered by a Swiss court to pay Iran in Swiss francs, just prior to the Obama Iran funds transfer. The first amount payable was about 300 million, close to the first transfer to Iran of 400million (Incl. interest?). The second amount payable was 1.3billion, and then Obama sends 1.7billion. Obama's reason for the this was a weapons deal around 1979 (unverified), however at the same time the court case was over a Israel-Iran agreement going back to 1979 in relation to the sale of oil between Iran and Israel.
It fits the same timing, two deals, Swiss francs and the same time period (1979)… Sounds to me that the US was blackmailed by Israel to pay off their debt to Iran.