re: Do all dc have buyouts like Pelini on contract

It would be highly unusual for a professional services contract of any kind, including a coaching contract to have performance guarantees as a trigger for "good cause" for termination.
There are too many other factors which could affect outcomes on the field. You really cannot fault Woodward for that. No coaches have such contracts, that I know of.
However, we paid WAAAY too much for Pellini and he was a poor choice.
Orgeron and Woodward, in that order, have to account for this error.