"Choose your adopted son or your blood son. It must be one of these two!". Since when is Tim related to the al Ghul family? Ra's wanted a perfect specimen, and here Batman was offering HIS own body--he's what--29? And billion-year-old Ra's sez, "I crave YOUTH!" So Ra's wants to come back as a prepube? Just a lame shoehorn into the plot to make Tim the focus instead of Damian because Tim is the editorial favorite.