Correct - the top shatter patty is the ethanol...but (from reading and listening to GW more), it seems that the chlorophyll pickup should be minimized due to the well sifted kief and any plant matter should get picked up by the coffee filter I'd figure?
I 'think' it should be possible to get a nice amber shatter from the ethanol wash...I just haven't done it yet. But I have also been doing 99% of the purge under a double boiler that is getting reasonably hot (much hotter than I do with the butane/vac process anyway) and didn't realize that I could put a deeper pool of alcohol in the petri dish in the vac chamber and it would boil off under vac (although not sure how long that process takes). Interestingly though - the ethanol washes I did on the kief were dark right away...the only runs I have done with ethanol before came out really clear in the alcohol until I cooked the purge.
Most of the more darkly colored elements in the extraction, are the more polar elements, so alcohol will always produce a darker extract than a non polar extraction.
On the other hand, some of those polar elements are also tasty, so my palate doesn't care about the darker hues.
Both BHO and QWET extracts suffer from the Beers/Lambert effect, in that one thin film is light colored and transparent, and two or more thin layers may be opaque.