Dead zones in Protoplanetary Disk and its effect on the Ice Line

On the Evolution of the Snow Line in Protoplanetary Discs
http://arxiv.org/abs/1207.4284

Apparently taking into account turbulence "dead zones", you can get water-poor terrestrial planets to form. Regions of ice-rich planetesimals < 1 AU from the star can permit the formation of giant planets. I wonder if this provides a key to explaining some of the systems Kepler has been observing, with multiple low-density planets.

Nice astrobites article that breaks it down a bit
http://astrobites.com/2012/07/25/snow-lines-and-protoplanetary-disks-or-whered-all-the-water-go/

Hmmm. Given this study, might it have been possible for Venus to have formed without any water at all?

Of course, more studies may be needed to either confirm or refute.

So it may be possible to have terrestrial type planets forming outside volatile-rich, Neptune-like ones. I wonder what's in the gap between planets f and d in the 55 Cancri A system...

It just dawned on me that this might have implications for explaining Kepler-20's architecture as well. Do you think that is feasible?