Forget haki then, at least improving his skills and new moves, something like this would be great to see in the battle. And as you said the always remaining the brain, tricky and good strategy, that Nami good skills. So she using it and overcome her limit would be important. Now watch how Oda using plotarmor against a stronger opponent in the future. How is Nami going to win when she has problems with Ulti? The one who coming as next is going be even stronger.