Personal experience, been top 1 both bunshin for a week+ with power diff around 10k+, clear most campaign maps at 3-4k power diff, these things u can use 100x fine with no problem until hit 0 dmg :))))), but try not to over-reach with bunshin, as these are pvp battles, and are checked more frequently along with player report, and constantly level to prevent periodical check. Event-wised, I advise u to use it cautiously, team CP should be no less than 13-15k+ for a "proper" check on insta guild boss kill + overtime dmg (got 1 acc banned due to low power, at 8k with constant 6-7 1-shot runs), dmg mul for event should be based around ur team overall cp, try 15-18x for 33k+ hunt point and "legit clear" check. Gud luck!!!