So this is just in its early stages of theorizing, but I believe we may have seen the last of the behemoths. I say this with the thinking that if there were a bunch of them, arrowhead wouldn't have been so popular (arena, bell, colony). And we do know that the behemoths are tough skinned like the inklings, and incredibly durable like the inklings. My thoughts are that behemoths were the early tests for pinstripes inklings.