Mostly his background :face scarred but not in game, either a great tribal warrior or a Legionnaire from 12, the way Caesar describes it and the way he talks don't seem to match perfectly.. you could reconcile all of this, no doubt, but the presentation felt a bit jarring. I admit though, I probably overreacted by defining him as "terribly" inconsistent.
Yeah, I'm fairly sure he wrote the main storyline (though with some input from Josh, as far as I understand, who wanted some things to be put in the game, like Caesar referring to Hegelian dialectics).
Also, Mr. House, Benny and Victor are all excellently written characters, so I admit, I may have been a little too quick calling him off.