Clearly Nava is white hot and has been since before he came up. I don't think he will fall off a cliff edge though unless we face a bunch of good pitchers in a row, guys that can overpower him. I do think he can be overpowered and some good "heavy" pitching combined with Nava coming off this peak might not look so hot. However unless he faces a steady diet of some tough pitchers, I don't think he will fall off a cliff edge. What he has won't go away easily, at least I don't think so.