One of the hiring requirements of intelligence officials is that they must be intelligent.
They would hardly take a job where guessing wrong gets them a firing squad.
In my prior life folks would bring briefings to us that had a little box and describe it as where intelligence "fusion" occurred. But when you ask them to describe what exactly this "fusion" was the result was some exceptional tap dancing. Fusion is one of those amorphous terms is often used and seldom defined.