Oh, i hope he goes! Honestly, in any group, there are usually more people striving to be leaders than followers. As long as he can code, and is willing to code other peoples ideas, he would be helping his team.

The fun of a group endeavor like this is, seeing ideas come out of seemingly nowhere. He may not have a fully thought out idea for a game, and that may be why he doesnt want to go. But that is not the point of his going. Its to work as part of a team.

Somebody else MAY have a fully thought out idea. The other team members will help implement it, and find problems and improvements in it.

It will be a good intro to college projects and work projects. Hard workers are always welcome!

Eta - and yes, i have participated in many such teams. Usually i would work mostly alone as a coder, but team work also happened. Its a good way to hear yourself thinking compared to other peoples thinking. You dont have to do ALL the talking.