@Timeloop Thanks, all that could make sense I guess.

Also another query, it is implied that this doctor  is quite old and is the one that takes River to the Singing Towers or whatever they were and gives her […]

Wait a minute, the doctors tomb was in the TARDIS, and the TARDIS was the CURRENT TARDIS. Does this imply that the TARDIS we are seeing now (interior) will be the last ? Or was it just one of those things they […]