[EricH]

When you do an application, you don't have to reject anybody.

If you're smart about it, you can use the application to get contact info, emergency contact info, and what part of the team a person wants to be on (mechanical, electrical, programming, non-technical, CAD, that sort of thing). That makes sorting them into subteams easier, and it makes it a whole lot easier to contact them if you need to. (And I hope you never have to use the emergency contact information, but if you need it it's there.)

You can ask someone to leave the team later, if you need to; usually, that would only be if they're being counter-productive or if there are "other issues" that need to be resolved.