Perhaps it is time that we look at the situation of Condor Legion colours, not by what numbers people say were used, but by what we can see,and what they would have likely used. In other words, what makes sense.
Many of the aircraft were supplied in either four colour camoflage, ( Grey, DarkGreen, Brown, and Light Blue ) or Three Colour camoflage ( DarkGreen, BlackGreen, and Light Blue ) or in Overall Grey. In the first two cases, the appropriate Luftwaffe schemes were used.
Now for the aircraft that were Overall Grey. At this time, the aircraft operated by Lufthansa were in Overall Grey with Black trim, or Overall Bare Metal with Black trim. Some of the aircraft supplied early in the SCW apparently were marked in ways similar to Lufthansa aircraft ( He 70s and some of the Ju 52s spring to mind )
The Condor Legion Messerschmidt Bf 109s appear to be, with a few exceptions. mainly Overall grey with Black Trim. I doubt that anyone was mixing up paint specifically for them. So, what is most likely is that they were given a quick coat of either a light grey 'primer' or the very similar Lufthansa Grey, and sent to Spain, presumably to get an appropriate coat of camoflage when they arrived. Which they never did..... So, what we may be looking at might not be an exterior RLM colour, but rather either the Lufthansa Grey, or a Primer Grey. Both would allow the German government to deny that these were German military aircraft which were, in any case still unlawful under the Versaille Treaty.
I hope that I have served to further confuse the situation.
Paul R. Ward