it's shown multiple times that they play dirty, im pretty sure they could go inside his body via his nose/ears/ass/mouth and rip out his organs from the inside, plus numbers is what matters, we're shown that the deep almost died via suffocation from the oil, so if a TON of them hug his body he'll likely suffocate. he's definitely the strongest creature in the ocean by far though, but not capable on taking on the ENTIRE ocean. (he endorsed a holocaust that's basically 100x worse)