I don't think it's likely, but maybe Carr starting was the plan but Carr got pissed because they asked him to take a pay cut and wants to be traded. That would explain why they initially came out declaring they wanted Carr to start and restructured his deal. They may have thought Carr would get over it but maybe he, or more likely his agent, is making noise that makes them think it won't be a good situation to keep Carr against his wishes?
I'm obviously speculating and none of this seems likely, but that's one explanation for how things have gone down.