Totally always, though he's not one to talk considering how often he'll get distracted by things as well. Either way he'll notice Little Dipper which means.

Yup, that is his sisters voice.

"Mabel!"

Just....being in different universes sucks and he has no idea how Stan or Ford managed to cope for so long. But so, so happy and running over. Little Dipper is probably orbiting his head.