i doubt you can 1 shot properly geared player unless you are in a dead server with no very active jonins around. from my experience getting rekt by oragiri of server 7 who has ninjas with 8k to 10k + attack / nin dmg ninjas and over refines lvl8 to 10, he does 1 shot some ninjas but not the tankier ones. you can focus buff oro but i doubt he will 1 shot anyone unless you are or on oragiri of server 7's level.