pyramid or block sets?

[HOLLYWOOD]

15-10-6-2 for growth so that all possible muscle fibers are being hit, 10-8-6-4, i could see this type of pyramid being a problem becuase of the rep ranges being so close that the following set would be weakened from the set before, or soemthing like 3x5, the problem with this is the lack of rep ranges and the fatigue of the same muscle fibers being worked...

basically what i want to know is if you perform 1 set to failure in the 6-8rep range lets say, will another set in the same range be beneficial, or did that 1 balls to the wall set in that range recruit enough muscle fiber to move onto the next range...???