+hp -atk LA!Roy worth using?

I wanted to brave bow him, so that's already raising Gordin to 5 stars to feed. But if he's already -atk would that investment be worth it?
I wanted him to be able to kill any big threat in the arena, particularly Ayra. If I were to brave build him, he would only be able to kill her with a combination of hone and goad cavalry buffs. I don't run horse emblem, so, again, is it all worth it?
I really don't wanna try summoning for another one.