Obama would never endorse Clinton if there was any possibility of an indictment.
Not necessarily. He may be ready to pretend to be shocked (after the convention and its to late for Bernie) that it "turned out" there was something to the email thing. If one goes for the Biden/Warren swooping in theory. I am dubious of this theory, but one never knows with this bunch.
Yes he would. He was told to make the endorsement and the indictment issue is of no consideration for him, and even if she was indicted, how would that hurt him ? He's not running for office. Any office.