That last reason is just asinine. U_U There's no garuntee of any Senju getting the Mokuton just because their of the blood lineage, Tsunade is a perfect example of that and Hashirama is the only one to have Mokuton (not including Yamato because his isn't natural).Ugh we should've at least put some reasons he was bad, like forcing the Senju and Uchihas to try and live in harmony, and not giving his descendants the right sperm for wood style....