Nah! Come on man!
Nadal is going to be winning clay tournaments FOR SURE! Even at 80% health. I personally think anything less than 90% of his best will not beat a 100% Djokovic. I feel Nadal has to play 100% to beat a supreme form Djokovic. But Nadal can play at 75-80% against anybody else on the tour on clay and still win, including Federer, Murray and Del Potro.
On hardcourts and grass though, nothing less than a 100% Nadal will be taking the title unless everybody else is playing far below their levels too.