The Japanese will probably be first with a preliminary report, based on their interviews with the Crystal’s Master, Offices and crew. The Master has already left Japan and the ship have sailed from Yokohama to Sekisakip: https://www.vesselfinder.com/vessels/ACX-CRYSTAL-IMO-9360611-MMSI-548789000
Why the Master was taken off is unknown. Maybe he was due for crew change, or maybe he was sent out of Japan before somebody decided to arrest him, “just in case he had done something wrong”, which has become the norm whenever there is an accident involving ships.
Whether the Japanese and Filipino investigators will be able/allowed to have unfettered access to the watch standers on the Fritz is left to be learnt. (Or maybe not?)
PS> It may be too late to hope for unhindered and uncoached statements to be had, since the Navy’s “legal eagles” are probably coaching them right now.