Personal hypothesis is that google threw a bone to those who link scrubbed and/or disavowed to encourage this type of behaviour.
For those of you who did scrub and/or disavow, how were you affected by Penguin 2.1?
I'll start. Hammered with penguin 1.0...and after a lot of scrubbing/disavows, I've pretty much recovered to pre-penguin levels.
This is very remarkable to say the least...