Well, the ABC does get to decide with whom Canterbury is in Communion ... and since the Episcopal Church defines itself in terms of its Communion with Canterbury ... I guess ++Rowan can invite any bishops he wants, and can exclude whomever he wants.
The question at the time of his selection was whether he'd value Communion above liberal theology or vice versa. For whatever reasons he's apparently much more interested in the Communion. One of the reasons, I'm sure, is that the Orthodox side is doing serious, heavyweight, for-the-ages theological scholarship on this, and the academic in ++Rowan is impressed by that. The left has no theological underpinning that can compete (hence, the orthodox are "theological bullies").
The left clearly hates that their victim gambit can't compete.