I would imagine the big challenge facing the managers of a lot of Chase co-branded card programs is simply that Chase has developed a product-- the CSP-- which is simply better, earning wise, than all of their co-branded cards.
I'll admit I don't understand who makes the decisions and how they come to decide which features get added, but if I'm a manager of a Chase co-branded credit card, I'm going to try and differentiate my card from the CSP as much as possible. I can't imagine someone at Hyatt doesn't recognize this. Are there some other factors in play here?