Yamato has a passive called Hokage style Elder Jutsu - tenth edict on enlightenment that says that he will boost damage of a summon or tailed beast(huge monster in other words).
Does this abbility stack? if you pepperd your ninja teams with Yamatos, does it suddenly go from 100% to 300% or even 700% if you but 7 teams with a Yamato in it each?

Has anyone tried this? If so, please share.