Yup, that's a major part of Chael's stance: he said he wanted it and was preparing for it, and then when the opportunity came he said he wasn't ready and wouldn't do it.
And I agree on Chael from another standpoint. Chael said that the moment Aldo knew McGregor was fighting RDA he should have been preparing. I don't think he should have launched into a camp like Chael says, but he really should have been preparing. McGregor has been Aldo's known opponent for like a year now. That is the target Aldo's been aiming for this whole time, how are you not possibly prepared to take that fight the moment it's offered? You should be chomping at the bit to get that rematch, especially after you just lost to him after everything.