SA claimed that he is colorblind and had been told that that may be why he did not see the glass on the CBS News interview with David Begnaud in late November.
This over 4 months after Chloe's death, and from the sequence of events, appears to be a new diagnosis.
IMO they were scrambling for some kind of tangible reason for SA lifting Chloe to an open window. I would be willing to bet that he does have a doctor's statement that color blindness can affect the ability to see dimensions.
The line of thinking, apparently, is that if there had only been glass there, no negligence could have occurred.
Hence the shrugs by Winkleman. "I set my kids up on stuff all the time," he answered, when asked about the wisdom of setting a child on a high railing, regardless if you thought there was glass there or not.