I agree with cricket and others, that it could be better to give the kid a foundation for communication in the form of other games. You might try Mario games -- they're universally known in kid-dom, and not violent or inappropriate. Minecraft is good too, though for that age you'd want him to play only offline -- but it's becoming a kid universal, as well, and is a good basis for conversation with other kids. It really helped DS with his social skills learning to have that basis of friendship going for him -- he was actually ahead in it, but when the other kids caught up to him in being able to play the games (learned to read, for one), and he was the guru, it was a big help.
You might also see if the school does any social skills groups or classes -- ours was terrific for that, when DS was in early elementary.
