I'll say this. I agree with those who find it strange that Donny Marshall would be fed this info and no one else. But for what it's worth, he is a part of the local station that covers the Celtics, which is of course CSNNE. Even if you wanna say he's not Sherrod, it's not like he's on ESPN or something.
But at the end of the day, considering it's more or less clear that Danny was trying to go for broke on CP3, I don't think the idea that the Celtics are still shopping around Rondo should be news, let alone farfetched simply because Donny said it. I suppose the real question is, who is Danny considering getting in exchange for Rondo.