Yes, quite a puzzle
First off we have continually had marketed that Igzo is lower power, especially for static images so why is there no static power draw info?
Obviously for reading purposes this is very important.
You could almost burn yourself on the old Retina iPad panels so comparison there is not really that sweet.
Now the Kindle LTPS is far more expensive to producce and unless I have been suckered by marketing has higher power draw, at least for static...