Kinda break my heart to read these. Luigi is a great character. Even braver the Mario. Bravry is being able to rise above your fears to overcome obstacles.
Mario is confident he can complete task.
Luigi... does it because its the right thing to do and he would rather do whats right then see others suffer. It takes a lot of guts to put yourself into harms way when all you can think about is how horrible an end you a most likly going to meet. Its like my being phobic of being eaten alive yet jumping into a tank with a great white to save someone else. That... take tons of courage.
To be honest you are right... but Luigi is still braver. I mean it obvious Luigi is scared sh**less most of the time. Takes a lot to be able to stand in front of an obsticle when your legs wobble more then jelly.