well...orochimary bestowed Yamato with the genetic material from hashirama, the first hokage. therefore yamato is almost a clon of the first hokage but not as powerfull!! yamato has the same ability like hashirama of the wood release, a powerfull technic. yet from the times u have seen yamato engage I'm battle he is rather weak and they even captured him and is presently been "cultivated" by tobi and kabuto. on the other hand Madara, somehow, grab himself some of the cell of hashirama and his wood releese is exceptionally powerful!! let me know if anyone else shares my opinion and think yamato has been badly under rated!