Similarly, David Henige and Marion Johnson question Akinjogbin's argument. While agreeing with the evidence from Akinjogbin that trade did slow after Agaja's rise, they find that the evidence does not support any altruistic or moral opposition to the slave trade as the reason for this. In terms of the Bulfinch Lambe letter, they maintain that its authenticity remains "not proven" but that since Lambe was provided 80 slaves when he was released, it is unlikely that Agaja's motivations were clear. Instead, they argue that the evidence supports Agaja trying to get involved in the slave trade but being unable to do so because of war with the exiled royal family of Whydah and the Oyo Empire. They write: