The use of can and could

Hi, I want to know if it is possible to use 'could' to talk about present/future ability. I was reading a book called Bestial: The Savage Trail of a True Amerian Monster and I came across this line "I don't think anybody could say as to that particular man just what the influence of that accident or that concussion was", and as far as I know, could (when we are talking about ability) is only used for past ability. 

 

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