Would love to have him, no shadow of a doubt. But for Cavani?!?! Cavani imo is the best #9 there is today, I'd take no strikers over him (except Zlatan).
Higuain is a top player, and has been quality for Napoli, one shocking miss does not change that. He's contributing quite a lot to the build up play at Napoli, more so than he did at Real, I've been impressed by him this season.
That being said, he does have a tendency to miss easy chances every now and then.