The U.S. military would logically want to take custody of the robot's wreckage, and Superman is willing to cooperate with them. Batman is obviously not as trusting, so I think it makes sense for him to go behind Superman's back and secretly obtained some of the alien tech. Also, I'm really looking forward to having Superman and Robin interact. Superman is so iconic and our Robin is so often starstruck that I think it's going to make for a fun dynamic.