Something about Ben Beckman
According to Eiichiro Oda, Beckman has the highest IQ of all the characters introduced in the East Blue saga. Since he is a first mate to a Yonkou, he presumably possesses a great deal of strength. Kizaru, an admiral, chose not to fight him, even though he had just fought the first mate of Whitebeard’s crew, Marco, and Whitebeard himself. It should be noted that Kizaru did however continue his attack on Luffy despite Beckman aiming his rifle at him (perhaps he felt he could dodge the rifle shot due to his ability to move at the speed of light).
Beckman also single handedly defeated Higuma’s crew of mountain bandits, telling Higuma to bring a warship as backup if he wanted to fight them.