Fighting his Shadow isn't the same as utterly destroying the real man in the real world, but I'll give you that.

[Akechi's grudge was far older and more personal, after all. And while he'd very much considered fighting his father in his own Palace, he'd determined it too much a risk. Yet another thing to be jealous of Ren for, for achieving that kind of closure.

It doesn't help his scowl as he shakes his head.]

Not that much. You're wasting it.