[kyrers]

In my (little) experience, Rick like developers can cause lot of trouble if they simply decide to leave.

I do think, though, that you can spot them fairly easy. Even in college. I had a very skilled classmate that wrote code only he could understand, without any comments. Of course, we could eventually understand it, but it would cost us hours.

Some teachers actually refused to grade his exercises if he didn't start commenting his code. I still believe they did this to instill in him this habit, but I'm sure it was hugely helpful to them as well.