Probably writing reports.
Seriously, if Aokiji can somewhat be translated to "attack" and Kizaru "defense" what is left is speed, but since Shanks did a number on him that can not be his speciality, or endurance, but it would headbutt with the logia dodge speciality (in Marineford he somewhat took WB pirates attacks but I'm not sure if that was dodging through his df or tanking them). Yet for sire what he has shown in Marineford was extreme power and violence by mauling WB but that would somewhat overlap with Aokiji... Really no solid idea about this yet.