Also another thing I noticed in the anime of part one during the battle between the 3rd hokage and oro is that oro applied hand signs in order to get the edo kage to move. This to me shows that the binding of those edo's was much stricter then the one we see in the manga today and could raise argument that if oro was strictly controlling the 1st and 2nd hokage during that battle oro may not of had the capabilities or knowledge to unleash their full power. Just something to think about for all those people who think that little patch of trees is seriously the extent to the 1st hokages power and that the 3rd actually beat the first and second with a doton, a summon, shadow clones, an impressive sense of smell..., and the RdS