[Shun has an inkling of what Hibiki's powers might involve, but not enough of one to jump on that.]

It's better to have the actual equipment, since it means you don't have to memorise the more complicated rules and exceptions or calculate things on the fly.

[Shun can do both, admittedly, but he's been playing a long time, aiming to be a professional, and is pretty good with numbers, so he's not exactly the line average.]