Actually it was Rose. The hotel complex was all about faith and who did he believe in and lobe more than anyone in all of space and time? Rose Tyler, she was who was in his room and that's why he went "of course, what else could it be" bc it was Rose
BEST THING EVER! 10 Disney Heroines Chosen To Be "Doctor Who" Companions. Even the ladies of Disney can’t resist the call of a mad man in blue box. Artist Karen Hallion mostly leaves which Doctor to your imagination.