[Taylor]

I've had students who didn't "play well with others", miss assigned tasks, etc. Other students approached me about the roes on the team, and perhaps so-and-so didn't belong. My response, and I presume yours as well, is that the person in question needs what FIRST can offer perhaps most of all.
A series of serious conversations are certainly in order. Maybe this student needs a Come-To-Jesus moment (or Ganesh or Allah).

There's a FIRST-A-Holics Anonymous(FAHA) thread in which you can post these questions to the public in an anonymous manner.