Subaru from re zero gets transported to Mount Sumeru instead of Seo. Would he beat the final villain?
He'd have the radiance mantra instead of return by death. Let's say he was friends with Seo and company at earth for like a year and instead of Seo being the ender, Subaru is. Would he make Hong fan his friend and 'beat' him given the circumstances?
I'd personally say yes. Subaru is just as a nut job as Seo. And they also value connections, friends and such.