He had the right to exercise it right away but we will know it soon if Kambosos and his camp definitely did the right thing for rushing the fight, we didn't know exactly what happened behind the scenes but it looks to me that Kambosos was a having a hard time accepting the reality and that he was overwhelmed by Haney.
I agree, he needs another fresh strategy to overcome Haney's technicalities because if he and his camp cannot find that something that might lead him the win he needed then I'm afraid that Kambosos is just adding the embarrassment he experienced earlier this year.
I really hope that this is more than sour grapes coming from Kambosos and there was in fact something that affected his performance in his fight against Haney, if that is the case then we may get to see a more interesting fight than the one that we watched previously, but even then I do not think Kambosos will have too much of a chance to get the win, however if those are nothing but excuses coming from Kambosos then the upcoming fight will not be really that interesting to watch.
They definitely underestimate Haney in their first fight. Kambosos and his camp may have been thinking that they can go out there and push Haney and uses his power. But Haney is too smart for that one, and then uses his boxing IQ to out think Kambosos every round. When George think that he has the upper hand because Haney is in the corner then Devin will come up with pot shot that George can't avoid. And for sure his team see this and may have a better strategy in the rematch. But I don't see Kambosos overwhelming Haney the way he did against Lopez.