I am not sure if I agree that Crono and Marle died. I do agree that tge kingdom of Guardia did fall on 1005 but if Lucca built orphanage and found Kid (Schala) at 1007, then why when orphanage burned down, why was Crono and Marle drawing by kids at orphanage existed when they showed scene of orphanage burned by Lynx when Kid was dreaming about the past? Also, if Kid was 16 at Crono Cross and if the mysterious baby was inded Kid (Schala), her being age of 3 is bit of stretch.