Old Garp > Aokiji, all of Garp's performance combined with his bounty on par with the admirals, even in his old age, leaves this possibility open. The guy was constantly blitzing Kuzan with speed.
Aokiji was literally ignored during the battle, pushed aside by Garp, while Garp rushed to expend his stamina and energy on Blackbeard's commanders, just like what happened here with Pizarro.