I don't fully understand what you want to tell us with your screenshots.

Unlit does not mean that an object is black or something. It just means that the object's brightness won't be altered anymore by static and dynamic lights. It's 'frozen'. You might also set unlit in WED for even preventing the initial brightness calculation. If you want all sprites to be equally bright, just set their material colors accordingly.

The formula for the brightness of an object is described in the Beta manual.