Warren has been forced to make those fights. his deal with sky box office for khan meant he had to make big fights, sky can now say yes or no to khans opponents. Also warren had a deal in place to promote calzaghe vs woods at the 02, they feel through when calzaghe rejected the fight and went for hopkins, so the 02 needed a big fight, Macca vs Haye was his only option as Khan was not ready for a big fight yet.
Regarding Hennessy not having a rematch clause in the Witter vs Bradley fight, if the fight was a mandatory defence, as i believe was the case, then the champion cannot force the challenger to sign a rematch clause.
I just get the feeling that Hennessy is experimenting with new revenue streams, whether this experimentation is good for Froch's career remains to be seen.
Shame you didn't look up "Modern British History" before claiming Mike Tyson coming to the UK for a few days was the biggest event since the beatles coming back from america.
Difference being Taylor was the recognised champ and Pavlik wasn't all that at the time. If Taylor turned it down he would have been stripped of one belt and still recognised as "the man". Witter was a secondary belt holder without massive recognition or a huge following, and as such there wasn't all that much to bargain with.