Wainwright97

Hi all, Having recently completing RDR2, I have a few questions that I need answering I had the Legendary Arabian Horse throughout the game with Arthur, The horse dies in one of the final scenes as this is a Legendary horse am I able to find it again so that I can have it as Johns main horse. Also what happened to all the money at the bottom of the sea is it possible to retrieve it in any way. Thanks!