on How to loose a guy like Kari from your team here are the tips:
1. Keep him away from work and people for long
2. Drive all his ideas into Trash
3. Do not let him do what he is Best at
4. Do let him do what he does not like
5. Help him loose his confidence by doing things that a Data Operator can do
6. Do not let him learn and earn experience from the bigger brains
follow a few or all of this and it wont take more than moments to loose such a Gem from your Team.