Thank you buddy ;) if you have questions and want to avoid the mistakes we did when we first played Rise to War, feel free to join us on discord: discord.gg/QEhMgQdY
If you're trying to use him as a dps commander Dain is definitely better. I think Thorin can be a solid commander at r5 if you use him as a troop/damage commander.
Not sure if the last comment worked but if you need help building thorin I can assist. I've been maining him for a while on my good side account and have tested different builds and theory crafted more! Add me at Shilky#4576 if you want any extra knowledge on thorin!