Deep sea squid often use urea as floatation control so you probably would not like the giant's taste.
Northern pike are only aggressive when hunting, and the little arrow squid are mellow to until breeding time or feeding time, then they are lethal little killers.
Don't get me wrong as to the Humbolts, I admire them and realize they are competitive shoaling carnivores with large appetites, they go from eggs to senility in 3 years from what I read and that is not much time to get that big.
I fully agree that they need further study. I still would get a little nervous to find myself at night swimming amongst a feeding shoal.