You are right about that! In my opinion, they won't get those releases until JPMC pays for WMB's assets. Which I calculate to be approximately 64B. Here's the breakdown.
Commercial Real Estate: 30B Tax Returns: 6B TPS 4B WMI Loan to WMB (creditor Claim against FDIC): 24B
Total: 64B
Chase has the liability for the creditor's claim against the FDIC because they received the benefits of the loan.