I fail for not seeing this. I made a thread on it. I won't be able to sleep tonight for this.
I've only beaten the first version, which is.Spoiler!
He was a pain in the ass with that damned booster. My lightbulb went off after a while: Use Lightning, spam the hell out of Thunderfall, be patient, and done.
I'm curious what "version 2" of him will be like.