The fact that Teach dropped using his claw weapon, (which was strong enough to wound Shanks in close combat) should tell you that how effective Yami DF is against the non-DF users as well, not only against DF users.
He stomped the Impel down guardians with AoE.
He destroyed 1000 bazooka squad with ease.
Jinbe says Teach helped Luffy's group a lot by doing that.
He destroyed a town and Burgess was afraid of getting hit by Teach's power.
Burgess was afraid, even when he knew that Teach can choose the people he can pull.
Teach chooses not to pull Ace with his black hole gravity, he has full control over it.
He says ''not even light'' can escape from his power.
He pulled the marine soldiers in the war, who are probably not DF users.
He stomped the Impel down guardians with AoE.


He destroyed 1000 bazooka squad with ease.

Jinbe says Teach helped Luffy's group a lot by doing that.

He destroyed a town and Burgess was afraid of getting hit by Teach's power.

Burgess was afraid, even when he knew that Teach can choose the people he can pull.

Teach chooses not to pull Ace with his black hole gravity, he has full control over it.
He says ''not even light'' can escape from his power.

He pulled the marine soldiers in the war, who are probably not DF users.
