idk about that but if you mean what you need to fight him... just a good army of shadowmanes and it would be good if you mutated them but you dont need a yuty since the shadowmanes have the roar thing but its allways better to use a yuty since it has more HP and stam of course also bring poop like the health poition thing (dont remeber what its called) and of course bring a set of armor and also a good shotgun. all this just depends on which deficultiy you play on but just remeber always to have more with you then you think you need since you can be surprised... but its actally one of the more easy bosses if you ask me, it just always go perfect when i try killing him.
now when i think about it i havent done the team down river so dont think you need to do it but are not sure maybe i have done it without thinking about it