But don't you wonder why it isn't much more clear-cut and defined?
Is the RCC simply too big to deal with Chavez because he isn't the only one in need of rebuke?
Not sure what you mean by that. The hierarchy doesn't like him. I see no evidence that he practices his [supposed] faith, in fact, it's not entirely clear to me that he even still self-identifies as a "Catholic".
So what you have in Chavez -- as far as I've been able to determine -- is a non-practicing "Catholic" at odds with his bishop.
No point in excommunicating him (assuming he's not already done so himself latae sententiae): he doesn't "communicate" in the first place, and would just try to make himself a martyr.