There is no reason for him to care about anything else right now....his character shouldn't even be there and just like everyone else, he doesn't even KNOW who this random woman is that they're fighting.
So if you thought your BF was dead for years and find out he is alive and is in danger you wont care about his well being? obito actually needs help. sakura obsessing over sasuke is pointless. sasuke can handle himself number 1. number 2, sakura is worried about someone who is not worried about her. its apples and oranges if you ask me...