I think when Rands says:

In my next column, I'll explain the most important tool a manager has to avoid the Fez.

he doesn't mean that he'll explain how to get rid of Fez, but instead he means how to:

1. Keep from allowing a Fez to develop on your team

and/or

2. Motivate a Fez away from his Fezziness when/if it starts to develop

There are very few people who actively want to bring their team down. There are even fewer who actively want to bring their own career down.

Knowing Rands' past work, he's probably about to reveal some way to make Fez understand that he's become Fezzy before it's too late, and to recover from it (with 'separation' being the last alternative).