We played the game and he's changed quite a lot since the original two sessions.
It appears the beef was regarding a seeming inability to participate in any of the actual occurences in game. (I blame this on his character choice more than anything. I didn't know what the character was before the first session.) He assumed due to the fact we were adventuring around the dwarven mountains, his character couldn't/wouldn't interact. He basically ruined his own fun; I feel much less worried.
Anyway, his character is now much more on-line with both the party and the setting. The adventure I ran was much lighter on RP, much heavier on combat and strategy (Players particular love) and so on. I cut the game short due to medical reasons, but trying a slightly different tack meant the other players were less interested, but he himself was more interested.
I'll go back to the original way. I was bored by a game filled mainly with combat (Though admittedly, it was combat for a cause.) Sort of like a large-ish sidequest. If the player assumes his character is ignored by me because we aren't focusing on him specifically, I reckon he can deal. I've made the effort to include him.