As a personal opinion, I don't *believe* that the should is in the same universe. If it happens to be, by some slim chance, then the idea of a crossover is just... odd. Because the styles in art and storytelling is so different from one other. Admittedly, it'd be really interesting artistically to see the JL in such a different style, but I just don't think it'd work. It'd be... really weird, frankly. The styles just clash too much for a crossover.
"Sometimes, I wish Noah hadn't finished the ark in time. People suck." - The Question