Well this are Hashirama weapons pay attention to all the weapons !
Now we know that Madara " Died " with this weapons !
And here Madara has the weapons of Hashirama ! ( you can see 2 of his swords again and also the huge shuriken. )
I dont think after Hashirama tought that he "killed" Madara Uchiha he leaved those weapons on the ground and left without them !
So i belive Madara killed Hashirama somehow.... I cant imagine how he did it after he killed Hashirama he took Hashirama's weapons as a prize for himself !