I get the impression that Winfield Spencer was quite a capable man, on the basis of his naval career up to the time he and Wallis divorced. He was one of the US Navy's first tranche of pilots, became a flying instructor and was responsible for setting up and running a flying training school while still a Lieutenant and under 30. He was obviously thoroughly frustrated at being kept back from the First World War - maybe he felt guilty about that, especially after his favourite brother was killed.
If what Greg King reports is accurate (i.e. not simply based on what Wallis said in her self-seeking and ghost-written book) Winfield Spencer was far from being a good husband, but I feel a certain sympathy for him.
Ann