Being in a nominally high position in some organization is not a guarantee of mental acuity. Woodrow Wilson, FDR, and arguably Reagan and Biden were all mentally impaired while being President of the United States.
But we really know nothing...
Given the lack of information (for quite a few days now) about McCasland's supposed health issues, I think we can only speculate about it. But, even if some day his family comes forward clarifying he has had dementia or any other related mental...