I believe all the above is true...I've spent lots of time on the water, over many years, and am on a first name basis with bulls, up to c.450 lbs.
It's just that, in spite of the bites for which they are credited (rightfully, IMO), I've never heard of one swallowing 1/2 or all of a human, as great whites are known to do, and as the shark in NJ did. Who knows, though. The rest of that MO fits the bull, it is true. I've heard the stories from Lake Nicaragua, but am not sure if anything like that has been reported elsewhere.