Darth Nihilus Basic Attack Question (Cooldown reduction)

doesn't matter, reducing the CD by one will result in being able to use "drain force" the next turn.
edit: Correction, it could matter if your own CD's were increased right after you used "drain force", but before you used nihilus' basic.
I actually don't know the awnser, but i always assumed it reduces a maximum of 1 turn regardless of the amount of debuffs dispelled.