You know that a lot of us picked the Junior that we liked based on more than just their singing...don't lie now.
But what if during the whole thing you never saw them? You only heard their voices? Then who would you truely find to be the most fit for the band?
BTW: You don't know anything about their personality either because they only sing. Yes, it would make for a boring show but whatever...Play along.
I would prolly go for Morgan because he really does have a great strong voice. And Lucy, too.