Everyone had their role to play in the battle.
Klaus ensured that everyone had a specific role to fulfill before the battle began.
Kay was supposed to handle the long-range fighters. His job was to deal with the zombies who used bows and other long-range weapons. This way, his teammates and friends wouldn't struggle to defend against attacks coming at them all of a sudden.
Kay is an impeccable archer. He may not be as impressive as Veylor, but he is still a remarkable archer. In his past life, he was one of the greatest archers from the Phoenix race.
He unleashed his brilliance on many battlefields, and to this day, the Scarlet Archer's name still echoes in the dark corners of the universe.
As someone who had lived and become friends with a paragon, his legend is hidden to some extent, but his name is still called to this very day.