Unfortunately it seems One JSQ was knocked down to 777 ft during the FAA approval process. It's not clear if the FAA asked for this change, or the developer, but the original FAA filings had One JSQ at 942 ft, while the latest FAA applications show twin 777-ft towers. See the discussion here:
Also, it's 100% certain from other FAA documents mentioned in that thread that the FAA thought 99 Hudson's crane was too tall at 1100 feet in downtown JC; they knocked it down to ~1030 feet. Perhaps that had something to do with the 50-foot height chop that 99 Hudson received. If they won't approve temporary cranes at that height, it's gonna be a lot harder to get buildings approved at that height.
I hope chris08876 is right, though, and the FAA's becomes less strict in JC and LIC in the future.