Help me understand Linear Raw curve option

e.g. when Nikon D5500 it reports only 4096 levels max when linear raw curve is on, when off it reports 16384 levels which one is correct?

https://www.upload.ee/files/17759355/Nikon_D5500.zip.html

https://www.upload.ee/files/17535999/Canon.zip.html

When open in RawTherapee both photos show same ratio for R G B channels however in RawDigger its reporting something else e.g. if half of photo has blue sky RawDigger will show more intense Blue channel, guess its different stats.

Is there way to see ratios between R,G,B channels that shown in RawTherapee?

And whats the difference between this metrics used in both programs?

Any way to display RGBB pixels independently when i am in "RGB render" mode it does not show pixels separately even at zoom 1000% all mixed together only when i click OvExp UnExp checkbox it shows grid.

https://www.upload.ee/files/17495832/G_B_G2.zip.html

I have two DNG photos that i take from different phones when opening in rawdirgger it only shows RGB channel not G2 channel, is it a bug?

Very new to RawDigger (bought it today) An invaluable tool, but I am not clear why the over exposure threshold is not read from the Exif data. Files from my Sony and Canon cameras show "White Level" which looks very close to the maximum output of the ADC. Some quick maths shows that the Canon(M6) has specular white at -0.2EV, Normal White at -0.333EV and a Sony 7RII White at -0.1EV of 2^14. Though I have to accept that my 5DS is a little strange!