I'm pretty sure he's a Gamma and a Researcher. He's INTP in MBTI.
So, probably ILI. But, any other possiblities that come to mind?
I've been trying to get him to read the most likely type descriptions, but he'd rather do other things with his time. I think he would read one or two descriptions, though, if I narrowed things down.
Though, I know him pretty well so I can probably pretty accurately figure it out without him.