User blog comment:Paul.rea/Teen Wolf News 031715/@comment-75.82.117.155-20150318224619/@comment-4091815-20150319001739

Colton Haynes, Daniel Sharman and the Carver Twins had to sign contracts for the number of episodes in which they appeared.

I don't know where you get your information but you either don't understand how it works or are being purposely misleading.

When Colton left - they were negotiating his contract for Season 3. When Gage left they were trying to negotiate her contract. Everybody has a contract - it's just a matter of what the contract says.

And if you take only one lesson from this article it should be that actors appearing in the opening credits has little to nothing to do with their contract status - except to say that if they're in the opening they're more likely to be in all the episodes.