User blog comment:Blumenblatt/Robin's Strength/@comment-53539-20161209191211

Robin's always been a difficult one to judge. On the one hand, her physical strength of a singer limb is only as strong as the original limb its copying.... On the other she can combine the limbs for extra strength. But her primary strength has always been about submission and she can pretty much attack anything on the battlefield. And if he can see an enemy, its certain to be dealt with.

I won't say every crewmember needs to know Haki though, as Haki isn't the only way to fight and win.